CVE-2020-11501

moderate-risk

Published 2020-04-03

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.

Do I need to act?

11.5% chance of exploitation in next 30 days

EPSS score — higher than 89% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.4/10 High

NETWORK / HIGH complexity

Affected Products (6)

Gnutls

Ubuntu Linux

Debian Linux

Leap

Fedora

Affected Vendors

Debian Gnu Canonical Fedoraproject Opensuse

References (20)

Third Party Advisory http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html

Patch https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804...

Issue Tracking https://gitlab.com/gnutls/gnutls/-/issues/960

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202004-06

Third Party Advisory https://security.netapp.com/advisory/ntap-20200416-0002/

Third Party Advisory https://usn.ubuntu.com/4322-1/

Third Party Advisory https://www.debian.org/security/2020/dsa-4652

Vendor Advisory https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31