Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | gnutls 3.7.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.7.1-1 | — |
| Debian 13 | gnutls28 | 3.7.1-1 | — |
| Debian 12 | gnutls28 | 3.7.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.6 | USN-5029-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | gnutls +4 | 3.6.16-4.el8 | RHSA-2021:4451 |
| RHEL 8 | nettle +1 | 3.4.1-7.el8 | RHSA-2021:4451 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | gnutls +4 | 3.6.16-4.el8 | ALSA-2021:4451 |
| AlmaLinux 8 | nettle +1 | 3.4.1-7.el8 | ALSA-2021:4451 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | gnutls | 3.6.16-4.el8 | RLSA-2021:4451 |
| Rocky Linux 8 | nettle | 3.4.1-7.el8 | RLSA-2021:4451 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | gnutls | 3.6.7-14.10.2 | SUSE-SU-2021:0935-1 |
| SLES 15 SP1 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SLES 15 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SLES for SAP 15 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SLE Micro 5.0 | gnutls | 3.6.7-14.10.2 | SUSE-SU-2021:0935-1 |
| SLE HPC 15 SP1 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SLE HPC 15 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SUSE Manager Server 4.0 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SUSE Manager Retail Branch Server 4.0 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SUSE Manager Proxy 4.0 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
| SUSE Enterprise Storage 6 | gnutls | 3.6.7-6.40.2 | SUSE-SU-2021:0934-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | gnutls | 3.6.7-lp152.9.9.1 | openSUSE-SU-2021:0470-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.7.1-r0 | — |
| Alpine v3.23 | gnutls | 3.7.1-r0 | — |
| Alpine v3.22 | gnutls | 3.7.1-r0 | — |
| Alpine v3.21 | gnutls | 3.7.1-r0 | — |
| Alpine v3.20 | gnutls | 3.7.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | gnutls | 3.7.1-r0 | — |
| Alpine v3.18 | gnutls | 3.7.1-r0 | — |
| Alpine v3.17 | gnutls | 3.7.1-r0 | — |
| Alpine v3.16 | gnutls | 3.7.1-r0 | — |
| Alpine v3.15 | gnutls | 3.7.1-r0 | — |
| Alpine v3.14 | gnutls | 3.7.1-r0 | — |
| Alpine v3.13 | gnutls | 3.7.1-r0 | — |
| Alpine v3.12 | gnutls | 3.6.15-r1 | — |
| Alpine v3.11 | gnutls | 3.6.15-r1 | — |
| Alpine v3.10 | gnutls | 3.6.15-r1 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.6.14-5 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | gnutls +4 | 3.6.16-4.el8 | ELSA-2022-9221, ELSA-2021-4451 |
| Oracle Linux 8 | nettle +1 | 3.4.1-7.el8 | ELSA-2021-4451 |
Advisories 13
- ALSA-2021:4451 Moderate: gnutls and nettle security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4451 Red Hat Security Advisory: gnutls and nettle security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2026-3127 GnuTLS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 31, 2026
- USN-5029-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RLSA-2021:4451 Moderate: gnutls and nettle security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2021:0934-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0470-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0935-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- VDE-2022-010 PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release CERT@VDE · May 22, 2025
- ELSA-2022-9221 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 17, 2022
- ELSA-2021-4451 Moderate: gnutls and nettle security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1922276
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10
- FEDORA-2021-18bef34f05 vendor-advisory
- [spark-issues] 20210413 [jira] [Created] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- https://security.netapp.com/advisory/ntap-20210416-0005/
- [spark-issues] 20210417 [jira] [Commented] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210423 [jira] [Resolved] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210425 [jira] [Commented] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210426 [jira] [Commented] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210426 [jira] [Updated] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210429 [jira] [Commented] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list
- [spark-issues] 20210430 [jira] [Commented] (SPARK-35054) Getting Critical Vulnerability CVE-2021-20231 on spark 3.0.0 branch mailing-list