DescriptionGnuTLS 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs955556

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gnutls28 (PTS)buster3.6.7-4+deb10u8fixed
buster (security)3.6.7-4+deb10u10fixed
bullseye (security), bullseye3.7.1-5+deb11u3fixed
bookworm, sid3.7.9-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gnutls28sourcejessie(not affected)
gnutls28sourcestretch(not affected)


[stretch] - gnutls28 <not-affected> (Vulnerable code introduced later)
[jessie] - gnutls28 <not-affected> (Vulnerable code introduced later)
Fixed by: (3.6.13)
Broken-by: (gnutls_3_6_3)

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