CVE-2021-40528

lowpriority · track · 24OT risk · elevatedEPSS 0.014 · 73 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.42% (73rd) EPSS

CVSS 2.6 · low

Is it mine?

60 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.

remediations

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

A vendor fix is available.

Fixedlibgcrypt-0:1.8.5-7.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-0:1.8.5-7.el8_6.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-0:1.8.5-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-0:1.8.5-7.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-0:1.8.5-7.el8_6.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-0:1.8.5-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debuginfo-0:1.8.5-7.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debuginfo-0:1.8.5-7.el8_6.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debuginfo-0:1.8.5-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debuginfo-0:1.8.5-7.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debuginfo-0:1.8.5-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debugsource-0:1.8.5-7.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debugsource-0:1.8.5-7.el8_6.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debugsource-0:1.8.5-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debugsource-0:1.8.5-7.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-debugsource-0:1.8.5-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-0:1.8.5-7.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-0:1.8.5-7.el8_6.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-0:1.8.5-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-0:1.8.5-7.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-0:1.8.5-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-debuginfo-0:1.8.5-7.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-debuginfo-0:1.8.5-7.el8_6.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-debuginfo-0:1.8.5-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-debuginfo-0:1.8.5-7.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311
Fixedlibgcrypt-devel-debuginfo-0:1.8.5-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:5311

cvss

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

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.6–5.9

v2.02.6lowAV:N/AC:H/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 4.9 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.15.9mediumAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 2.2 · impact 3.6

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · Red Hat Product Security US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-327USprimaryCWE-327US

affected products (60)

Products and version ranges known to be affected.

Hitachi Ops Centerall versionscert_bundDEcpe:/a:hitachi:ops_center:-
IBM Security Guardium 11.3all versionscert_bundDEcpe:/a:ibm:security_guardium:11.3
IBM Security Guardium 11.5all versionscert_bundDEcpe:/a:ibm:security_guardium:11.5
Oracle Communications 1.11.0all versionscert_bundDEcpe:/a:oracle:communications:1.11.0
Oracle Communications 10.4.0.4.1all versionscert_bundDEcpe:/a:oracle:communications:10.4.0.4.1
Oracle Communications 22.0.0.0.0all versionscert_bundDEcpe:/a:oracle:communications:22.0.0.0.0
Oracle Communications 22.1.0all versionscert_bundDEcpe:/a:oracle:communications:22.1.0
Oracle Communications 22.1.0.0.0all versionscert_bundDEcpe:/a:oracle:communications:22.1.0.0.0
Oracle Communications 22.1.1all versionscert_bundDEcpe:/a:oracle:communications:22.1.1
Oracle Communications 22.2.0all versionscert_bundDEcpe:/a:oracle:communications:22.2.0
Oracle Communications 22.2.1all versionscert_bundDEcpe:/a:oracle:communications:22.2.1
Oracle Communications 22.2.2all versionscert_bundDEcpe:/a:oracle:communications:22.2.2
Oracle Communications 22.2.3all versionscert_bundDEcpe:/a:oracle:communications:22.2.3
Oracle Communications 22.2.4all versionscert_bundDEcpe:/a:oracle:communications:22.2.4
Oracle Communications 22.3.0all versionscert_bundDEcpe:/a:oracle:communications:22.3.0
Oracle Communications 22.3.1all versionscert_bundDEcpe:/a:oracle:communications:22.3.1
Oracle Communications 22.3.2all versionscert_bundDEcpe:/a:oracle:communications:22.3.2
Oracle Communications 22.3.3all versionscert_bundDEcpe:/a:oracle:communications:22.3.3
Oracle Communications 22.3.4all versionscert_bundDEcpe:/a:oracle:communications:22.3.4
Oracle Communications 22.4.1all versionscert_bundDEcpe:/a:oracle:communications:22.4.1

showing 20 of 60

advisories (3)

Vendor and ecosystem advisories describing this.

RHSA-2022:5311Red Hat Security Advisory: libgcrypt security update2022-06-30csaf · redhat_csafUS
An update for libgcrypt is now available for Red Hat Enterprise Linux 8. 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.
WID-SEC-W-2023-0137Oracle Communications: Mehrere SchwachstellenDeutsch2023-01-17csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.
WID-SEC-W-2023-1812Oracle Communications: Mehrere SchwachstellenDeutsch2023-07-18csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund redhat_csaf NVD CVE.org MITRE

published 2021-09-06modified 2026-06-17

related (918)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2023-22518US	critical9.8OT critical	100.0% (100th)	KEV	2023-10-31
All versions of Confluence Data Center and Server are affected by this unexploited vulnerability. This Improper Authorization vulnerability allows an unauthenticated attacker to re…
CVE-2023-34039US	critical9.8OT high	67.2% (99th)	Exploit	2023-08-29
Aria Operations for Networks contains an Authentication Bypass vulnerability due to a lack of unique cryptographic key generation. A malicious actor with network access to Aria Ope…
CVE-2016-2183US	high7.5OT high	94.7% (100th)	Exploit	2016-09-01
The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols and other protocols and products, have a birthday bound of approximately four billion blocks, which mak…
CVE-2016-6602US	critical9.8OT high	55.7% (99th)	Exploit	2017-01-23
ZOHO WebNMS Framework 5.2 and 5.2 SP1 use a weak obfuscation algorithm to store passwords, which allows context-dependent attackers to obtain cleartext passwords by leveraging acce…
CVE-2014-8687US	critical9.8OT high	43.8% (99th)	Exploit	2017-06-08
Seagate Business NAS devices with firmware before 2015.00322 allow remote attackers to execute arbitrary code with root privileges by leveraging use of a static encryption key to c…

+913 more

references (46)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan