7.4

CVE-2020-13777: canonical ubuntu_linux

CVSS: 7.4v3.1HighModified
AliasesALPINE-CVE-2020-13777MGASA-2020-0268SUSE-SU-2020:1584-1
Published 04-06-2020Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2020-13777 is a high (CVSS 7.4) vulnerability in canonical ubuntu_linux. EPSS estimates a 22.28% chance of exploitation in the next 30 days, higher than 97.6% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (NVD)
EPSS score
22.28%
0%100%
High · +4.78 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 3
OPENSUSE-SU-2024:10801-1CGA-2HC7-RQ3G-M6VHCGA-Q6H3-VMG5-V7W2

Timeline

  1. 04-06-2020
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

8 scores · 7 sources · 2 versions

EPSS trend

Probability

22.28%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

+4.78 pp

From 17.51% on 18-09-2026

18-09-202618-10-2026
EPSS score
22.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat10 products
  • gnutls< 0:3.6.8-11.el8_2 | < 0:3.6.8-9.el8_1 | < 0:3.6.5-3.el8_0
  • gnutls-c++< 0:3.6.8-11.el8_2 | < 0:3.6.8-9.el8_1 | < 0:3.6.5-3.el8_0
  • gnutls-c++-debuginfo< 0:3.6.8-11.el8_2 | < 0:3.6.8-9.el8_1 | < 0:3.6.5-3.el8_0
  • gnutls-dane< 0:3.6.8-11.el8_2 | < 0:3.6.8-9.el8_1 | < 0:3.6.5-3.el8_0
  • gnutls-dane-debuginfo< 0:3.6.8-11.el8_2 | < 0:3.6.8-9.el8_1 | < 0:3.6.5-3.el8_0
Suse5 products
  • gnutls&distro=SUSE Linux Enterprise High Performance Computing 15-ESPOS< 3.6.7-6.29.1
  • gnutls&distro=SUSE Linux Enterprise High Performance Computing 15-LTSS< 3.6.7-6.29.1
  • gnutls&distro=SUSE Linux Enterprise Module for Basesystem 15 SP1< 3.6.7-6.29.1
  • gnutls&distro=SUSE Linux Enterprise Server 15-LTSS< 3.6.7-6.29.1
  • gnutls&distro=SUSE Linux Enterprise Server for SAP Applications 15< 3.6.7-6.29.1
Debian2 products
Alpine1 product
  • gnutls≥ 3.6.0, < 3.6.14-r0
Canonical1 product
Chainguard1 product
  • gnutlsAll versions (No fix recorded)
Fedoraproject1 product
Gnu1 product
Mageia1 product
  • gnutls< 3.6.14-1.mga7
Opensuse1 product
  • gnutls&distro=openSUSE Leap 15.1< 3.6.7-lp151.2.18.1
Ubuntu1 product
  • gnutls28< 3.6.13-2ubuntu1.1
Wolfi1 product
  • gnutlsAll versions (No fix recorded)

12 vendors · 26 products

References

34 links
Show all 34 references