CVE-2016-6515

highpriority · attend · 60EPSS 0.586 · 99 %ileexploit · PoCDEEURUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
4 exploits · PoC
Likely / severe?
58.6% (99th) EPSS
CVSS 7.8 · high
Is it mine?
249 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-23

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.

01

remediations

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

A vendor fix is available.

02

cvss

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

7.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:N/A:Psecondary · Red Hat Product Security US
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Hsecondary · CVSS-BT (t0sche)
v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Red Hat Product Security US
v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · CISA US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20USCWE-20USCWE-20USCWE-770US
04

exploits (4)

Public proof-of-concept and weaponised exploit code.

05

affected products (249)

Products and version ranges known to be affected.

showing 20 of 249
06

advisories (5)

Vendor and ecosystem advisories describing this.

  • RHSA-2017:2029Red Hat Security Advisory: openssh security, bug fix, and enhancement update2017-08-01csaf · redhat_csafUS

    An update for openssh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  • SSA-412672SSA-412672: Multiple OpenSSL and OpenSSH Vulnerabilities in SCALANCE X-200RNA Switch Devices before V3.2.72022-12-13csaf · siemens_psirtDE

    SCALANCE X-200RNA switch devices before V3.2.7 contain multiple OpenSSL and OpenSSH vulnerabilities. The most severe of these vulnerabilities could allow a denial of service condition or could lead to execution of arbitrary code. Siemens has released updates for the affected products and recommends to update to the latest versions.

  • SSA-676336SSA-676336: OpenSSH Vulnerabilities in SCALANCE X-200 and X-300/X408 Switches2021-09-14csaf · siemens_psirtDE

    The latest update of the SCALANCE X-200 and X-300/X408 switches families fixes multiple OpenSSH vulnerabilities. The most severe of these vulnerabilities could allow a denial of service condition. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet available.

  • WID-SEC-W-2023-0449OpenSSH: Mehrere SchwachstellenDeutsch2016-08-01csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in OpenSSH ausnutzen, um einen Denial of Service Angriff durchzuführen oder um Informationen offenzulegen.

  • ICSA-22-349-21Siemens SCALANCE X-200RNA Switch Devices2022-12-13icsa · cisa_csaf_otUS

    SCALANCE X-200RNA switch devices before V3.2.7 contain multiple OpenSSL and OpenSSH vulnerabilities. The most severe of these vulnerabilities could allow a denial of service condition or could lead to execution of arbitrary code. Siemens has released updates for the affected products and recommends to update to the latest versions.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisa_csaf_otredhat_csafsiemens_psirtNVDCVE.orgMITRE
published 2016-08-07modified 2026-06-17
10

references (54)

External citations — patches, advisories, analysis.

scry

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