CVE-2015-2721

mediumpriority · track · 18EPSS 0.028 · 87 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.83% (87th) EPSS

CVSS 4.3 · medium

Is it mine?

62 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-27

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixednss-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.ppc64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.s390 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.s390x as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.src as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.src as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.src as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.ppc64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.s390 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.s390x as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-debuginfo-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.ppc64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.s390 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.s390x as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-devel-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.ppc64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.s390 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.s390x as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-pkcs11-devel-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop Workstation (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.s390x as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664
Fixednss-tools-0:3.19.1-1.el5_11.x86_64 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2015:1664

cvss

Technical severity, 0–10. One row per scoring source.

5.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.7–5.1

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v2.03.7lowAV:N/AC:M/Au:N/C:N/I:P/A:N/E:Usecondary · CVSS-BT (t0sche)

v2.05.1mediumAV:N/AC:H/Au:N/C:P/I:P/A:Psecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-310USprimaryCWE-358US

affected products (62)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
canonical ubuntu linux= 12.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 14.10nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 15.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
debian debian linux= 7.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
mozilla network security services= 3.19nvdUScpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
novell suse linux enterprise desktop= 12.0nvdUScpe:2.3:o:novell:suse_linux_enterprise_desktop:*:*:*:*:*:*:*:*
novell suse linux enterprise server= 11nvdUScpe:2.3:o:novell:suse_linux_enterprise_server:*:*:*:*:*:*:*:*
novell suse linux enterprise server= 12.0nvdUScpe:2.3:o:novell:suse_linux_enterprise_server:*:*:*:*:*:*:*:*
novell suse linux enterprise software development kit= 12.0nvdUScpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:*:*:*:*:*:*:*:*
oracle solaris= 11.3nvdUScpe:2.3:o:oracle:solaris:*:*:*:*:*:*:*:*
oracle vm server= 3.2nvdUScpe:2.3:o:oracle:vm_server:*:*:*:*:*:*:*:*
nss-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux (v. 5 server)all versionsfixedredhat_csafUS
nss-0:3.19.1-1.el5_11.i386 as a component of Red Hat Enterprise Linux Desktop (v. 5 client)all versionsfixedredhat_csafUS
nss-0:3.19.1-1.el5_11.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)all versionsfixedredhat_csafUS
nss-0:3.19.1-1.el5_11.ppc as a component of Red Hat Enterprise Linux (v. 5 server)all versionsfixedredhat_csafUS
nss-0:3.19.1-1.el5_11.ppc64 as a component of Red Hat Enterprise Linux (v. 5 server)all versionsfixedredhat_csafUS
nss-0:3.19.1-1.el5_11.s390 as a component of Red Hat Enterprise Linux (v. 5 server)all versionsfixedredhat_csafUS

showing 20 of 62

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2015:1664Red Hat Security Advisory: nss security, bug fix, and enhancement update2015-08-24csaf · redhat_csafUS
Updated nss packages that fix two security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 5. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

published 2015-07-06modified 2026-06-17

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references (87)

External citations — patches, advisories, analysis.

scry

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