Vulnerability in GNU Gnutls
CVE-2020-11501
GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.
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: 0.034 (88.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000
Affected products
- GNU Gnutls
- Canonical Ubuntu Linux — versions 19.10
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 31, 32
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.gentoo.org/glsa/202004-06 (vendor-advisory, Third Party Advisory)
- gitlab.com/gnutls/gnutls/-/issues/960 (Patch, Third Party Advisory, Issue Tracking)
- gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2 (Patch, Third Party Advisory)
- www.gnutls.org/security-new.html (Vendor Advisory)
- www.debian.org/security/2020/dsa-4652 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html (vendor-advisory, Third Party Advisory)
- security.netapp.com/advisory/ntap-20200416-0002/ (Third Party Advisory)
- usn.ubuntu.com/4322-1/ (vendor-advisory, Third Party 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)
Frequently asked questions
- What is CVE-2020-11501?
- CVE-2020-11501 is a high-severity vulnerability in GNU Gnutls, classified under Use of Insufficiently Random Values. CVSS score: 7.4/10. Published 2020-04-03.
- How severe is CVE-2020-11501?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2020-11501 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.