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Vulnerability record · CVE-2020-11501 · published 3 April 2020

CVE-2020-11501: Gnutls vulnerability

Gnu · Gnutls

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.

7.4 CVSS 3.1 High EPSS 3.4% · top 11.6% CWE-330 · CWE-330
7.4CVSS 3.1 base score, v2 5.8
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2 PatchThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/960 Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKY
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 Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31 Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2 PatchThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/960 Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKY
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 Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-11501), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.