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.
- Score
- CVSS 3.1 7.4 High
- Status
- Modified - cve@mitre.org
- Published
- 2020-04-03
- Last modified
- 2026-10-14
- Weaknesses
- CWE-330
Affected products
- Ubuntu Linux (Canonical)
- Debian Linux (Debian)
- Fedora (Fedoraproject)
- Gnutls (Gnu)
- Leap (Opensuse)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://security.gentoo.org/glsa/202004-06
- https://gitlab.com/gnutls/gnutls/-/issues/960
- https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31
- https://www.debian.org/security/2020/dsa-4652
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html
- https://security.netapp.com/advisory/ntap-20200416-0002/
- https://usn.ubuntu.com/4322-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NK…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO…
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
