CVE-2020-13777
Severity
7.4HIGH
EPSS
1.5%
top 18.75%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJun 4
Latest updateMay 24
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NExploitability: 2.2 | Impact: 5.2
Affected Packages2 packages
Also affects: Debian Linux 10.0, Fedora 31, 32, Ubuntu Linux 19.10, 20.04
🔴Vulnerability Details
3📋Vendor Advisories
4Microsoft▶
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 ↗2020-06-09
Debian▶
CVE-2020-13777: gnutls28 - GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ...↗2020
💬Community
4Bugzilla
▶
Bugzilla▶
CVE-2020-13777 gnutls30: gnutls: session resumption works without master key allowing MITM [epel-6]↗2020-06-03
Bugzilla▶
CVE-2020-13777 gnutls: session resumption works without master key allowing MITM [fedora-all]↗2020-06-03
Bugzilla▶
CVE-2020-13777 mingw-gnutls: gnutls: session resumption works without master key allowing MITM [fedora-all]↗2020-06-03