CVE catalog

CVE-2021-20231

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

[CVE catalog]

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Published: Mar 12, 2021, 9:49:00 AM UTC
Updated: Oct 14, 2026, 11:16:51 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.65% · Oct 25, 2026

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	gnutls28	sid	`3.8.13-1`	fixed
Debian	gnutls28	forky	`3.8.13-1`	fixed
Debian	gnutls28	trixie	`3.8.9-3+deb13u4`	fixed
Debian	gnutls28	trixie-security	`3.8.9-3+deb13u4`	fixed
Debian	gnutls28	bookworm	`3.7.9-2+deb12u7`	fixed
Debian	gnutls28	bookworm-security	`3.7.9-2+deb12u7`	fixed
Cpe	gnutls	Not reported	`3.7.1`	fixed
Cpe	enterprise_linux	Not reported	Not reported	unknown
Cpe	fedora	Not reported	Not reported	unknown
Cpe	active_iq_unified_manager	Not reported	Not reported	unknown
Cpe	e-series_performance_analyzer	Not reported	Not reported	unknown
Alpine	gnutls	3.10	`3.6.15-r1`	fixed
Alpine	gnutls	3.11	`3.6.15-r1`	fixed
Alpine	gnutls	3.12	`3.6.15-r1`	fixed
Alpine	gnutls	3.13	`3.7.1-r0`	fixed
Alpine	gnutls	3.14	`3.7.1-r0`	fixed
Alpine	gnutls	3.15	`3.7.1-r0`	fixed
Alpine	gnutls	3.16	`3.7.1-r0`	fixed
Alpine	gnutls	3.17	`3.7.1-r0`	fixed
Alpine	gnutls	3.18	`3.7.1-r0`	fixed
Alpine	gnutls	3.19	`3.7.1-r0`	fixed
Alpine	gnutls	3.20	`3.7.1-r0`	fixed
Alpine	gnutls	3.21	`3.7.1-r0`	fixed
Alpine	gnutls	3.22	`3.7.1-r0`	fixed
Alpine	gnutls	3.23	`3.7.1-r0`	fixed
Alpine	gnutls	3.24	`3.7.1-r0`	fixed
Ubuntu	gnutls28	20.04	`3.6.9-5ubuntu1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.9-5ubuntu2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.10-5`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.11.1-2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.11.1-2ubuntu2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.3`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.6`	fixed
Ubuntu	gnutls28	20.04	`3.6.9-5ubuntu1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.9-5ubuntu2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.10-5`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.11.1-2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.11.1-2ubuntu2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.1`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.2`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.3`	vulnerable
Ubuntu	gnutls28	20.04	`3.6.13-2ubuntu1.6`	fixed
Suse	gnutls	linux enterprise high performance computing 15-espos	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise high performance computing 15-ltss	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise high performance computing 15 sp1-espos	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise high performance computing 15 sp1-ltss	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise server 15-ltss	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise server 15 sp1-bcl	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise server 15 sp1-ltss	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise server for sap applications 15	`3.6.7-6.40.2`	fixed
Suse	gnutls	linux enterprise server for sap applications 15 sp1	`3.6.7-6.40.2`	fixed
Suse	gnutls	manager proxy 4.0	`3.6.7-6.40.2`	fixed
Suse	gnutls	manager retail branch server 4.0	`3.6.7-6.40.2`	fixed
Suse	gnutls	manager server 4.0	`3.6.7-6.40.2`	fixed
Suse	gnutls	enterprise storage 6	`3.6.7-6.40.2`	fixed
Opensuse	gnutls	leap 15.2	`3.6.7-lp152.9.9.1`	fixed
Suse	gnutls	linux enterprise module for basesystem 15 sp2	`3.6.7-14.10.2`	fixed
Suse	gnutls	linux enterprise micro 5.0	`3.6.7-14.10.2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	gnutls28	source	sid	`3.7.1-1`	not yet assigned	Not reported	Not reported
Debian	gnutls28	source	forky	`3.7.1-1`	not yet assigned	Not reported	Not reported
Debian	gnutls28	source	trixie	`3.7.1-1`	not yet assigned	Not reported	Not reported
Debian	gnutls28	source	bookworm	`3.7.1-1`	not yet assigned	Not reported	Not reported
Cpe	gnutls	cpe	Not reported	`3.7.1`	Not reported	NVD-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.10	`3.6.15-r1`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.11	`3.6.15-r1`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.12	`3.6.15-r1`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.13	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.14	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.15	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.16	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.17	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.18	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.19	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.20	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.21	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.22	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.23	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Alpine	gnutls	apk	3.24	`3.7.1-r0`	Not reported	ALPINE-CVE-2021-20231	Not reported
Ubuntu	gnutls28	deb	20.04	`3.6.13-2ubuntu1.6`	Not reported	UBUNTU-CVE-2021-20231	Not reported
Ubuntu	gnutls28	deb	20.04	`3.6.13-2ubuntu1.6`	Not reported	USN-5029-1	Not reported
Suse	gnutls	rpm	linux enterprise high performance computing 15-espos	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise high performance computing 15-ltss	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise high performance computing 15 sp1-espos	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise high performance computing 15 sp1-ltss	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise server 15-ltss	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise server 15 sp1-bcl	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise server 15 sp1-ltss	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise server for sap applications 15	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	linux enterprise server for sap applications 15 sp1	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	manager proxy 4.0	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	manager retail branch server 4.0	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	manager server 4.0	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Suse	gnutls	rpm	enterprise storage 6	`3.6.7-6.40.2`	Not reported	SUSE-SU-2021:0934-1	Not reported
Opensuse	gnutls	rpm	leap 15.2	`3.6.7-lp152.9.9.1`	Not reported	OPENSUSE-SU-2021:0470-1	Not reported
Suse	gnutls	rpm	linux enterprise module for basesystem 15 sp2	`3.6.7-14.10.2`	Not reported	SUSE-SU-2021:0935-1	Not reported
Suse	gnutls	rpm	linux enterprise micro 5.0	`3.6.7-14.10.2`	Not reported	SUSE-SU-2021:0935-1	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[gnutls-bin]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[gnutls-doc]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · all · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · all · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · all · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · all · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[guile-gnutls]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[libgnutls28-dev]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[libgnutls30]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[libgnutls-dane0]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[libgnutls-openssl27]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
[libgnutlsxx30]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 3.7.1-1
  nvd · gnutls28 · debian · bookworm

Observed: Oct 23, 2026, 5:54:12 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]