Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-11501

CVE-2020-11501HIGH

n/a n/a — GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  N    7.4   .0339   88.6     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Apr 3   Reserved by mitre
  Apr 3   Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2020-11501. Received CVSS 7.4 and CPE data from NVD.

CWE-330 · CNA: mitre · CVSS v3.1 · 11 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 3, 2020	Reserved	Reserved by mitre
April 3, 2020	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2020-11501. Received CVSS 7.4 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-330

References (11)

http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html [Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2 [Patch, Third Party Advisory]
https://gitlab.com/gnutls/gnutls/-/issues/960 [Issue Tracking, Patch, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/
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]

Authoritative record: CVE-2020-11501 at cve.org

Weaknesses: CWE-330

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-11501 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.