CVE catalog
CVE-2020-13777
GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 22.28% · Oct 25, 2026
GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.
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 | 3.6.14 | fixed |
| Cpe | fedora | Not reported | Not reported | unknown |
| Cpe | fedora | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Alpine | gnutls | 3.10 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.12 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.13 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.14 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.15 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.16 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.17 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.18 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.19 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.20 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.21 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.22 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.23 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.24 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.8 | 3.6.14-r0 | fixed |
| Alpine | gnutls | 3.9 | 3.6.14-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 | 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 | fixed |
| Suse | gnutls | linux enterprise module for basesystem 15 sp1 | 3.6.7-6.29.1 | fixed |
| Suse | gnutls | linux enterprise high performance computing 15-espos | 3.6.7-6.29.1 | fixed |
| Suse | gnutls | linux enterprise high performance computing 15-ltss | 3.6.7-6.29.1 | fixed |
| Suse | gnutls | linux enterprise server 15-ltss | 3.6.7-6.29.1 | fixed |
| Suse | gnutls | linux enterprise server for sap applications 15 | 3.6.7-6.29.1 | fixed |
| Opensuse | gnutls | leap 15.1 | 3.6.7-lp151.2.18.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | gnutls28 | source | sid | 3.6.14-1 | not yet assigned | Not reported | [962289] |
| Debian | gnutls28 | source | forky | 3.6.14-1 | not yet assigned | Not reported | [962289] |
| Debian | gnutls28 | source | trixie | 3.6.14-1 | not yet assigned | Not reported | [962289] |
| Debian | gnutls28 | source | bookworm | 3.6.14-1 | not yet assigned | Not reported | [962289] |
| Cpe | gnutls | cpe | Not reported | 3.6.14 | Not reported | NVD-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.10 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.12 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.13 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.14 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.15 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.16 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.17 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.18 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.19 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.20 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.21 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.22 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.23 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.24 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.8 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Alpine | gnutls | apk | 3.9 | 3.6.14-r0 | Not reported | ALPINE-CVE-2020-13777 | Not reported |
| Ubuntu | gnutls28 | deb | 20.04 | 3.6.13-2ubuntu1.1 | Not reported | UBUNTU-CVE-2020-13777 | Not reported |
| Ubuntu | gnutls28 | deb | 20.04 | 3.6.13-2ubuntu1.1 | Not reported | USN-4384-1 | Not reported |
| Suse | gnutls | rpm | linux enterprise module for basesystem 15 sp1 | 3.6.7-6.29.1 | Not reported | SUSE-SU-2020:1584-1 | Not reported |
| Suse | gnutls | rpm | linux enterprise high performance computing 15-espos | 3.6.7-6.29.1 | Not reported | SUSE-SU-2020:1584-1 | Not reported |
| Suse | gnutls | rpm | linux enterprise high performance computing 15-ltss | 3.6.7-6.29.1 | Not reported | SUSE-SU-2020:1584-1 | Not reported |
| Suse | gnutls | rpm | linux enterprise server 15-ltss | 3.6.7-6.29.1 | Not reported | SUSE-SU-2020:1584-1 | Not reported |
| Suse | gnutls | rpm | linux enterprise server for sap applications 15 | 3.6.7-6.29.1 | Not reported | SUSE-SU-2020:1584-1 | Not reported |
| Opensuse | gnutls | rpm | leap 15.1 | 3.6.7-lp151.2.18.1 | Not reported | OPENSUSE-SU-2020:0790-1 | 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 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [gnutls-doc]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· all · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [guile-gnutls]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [libgnutls28-dev]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [libgnutls30]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [libgnutls-dane0]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [libgnutls-openssl27]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
- [libgnutlsxx30]Unknown
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.6.14-1nvd · gnutls28 · debian · bookworm
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-398330.json]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_2637.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2020-13777]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-13777]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-13777]
- [https://osv.dev/vulnerability/DSA-4697-1]
- [https://osv.dev/vulnerability/SUSE-SU-2020:1584-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-13777]
- [https://osv.dev/vulnerability/USN-4384-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:0790-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-13777]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-13777.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2025-0227.json]
[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]