Vulnerability in GNU Gnutls
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 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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.223 (97.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.175 · newest: 0.223 · change: +0.048
Affected products
- GNU Gnutls
- Canonical Ubuntu Linux — versions 19.10, 20.04
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 31, 32
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gnutls.org/security-new.html (Vendor Advisory)
- www.debian.org/security/2020/dsa-4697 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202006-01 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4384-1/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html (vendor-advisory, Broken Link)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20200619-0004/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-13777?
- CVE-2020-13777 is a high-severity vulnerability in GNU Gnutls, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.4/10. Published 2020-06-04.
- How severe is CVE-2020-13777?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2020-13777 known to be exploited?
- 22 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.