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-2020-24659

CVE-2020-24659HIGH

n/a n/a — An issue was discovered in GnuTLS before 3.6.15.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0383   90.0     —

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

TIMELINE
  Aug 26  Reserved by mitre
  Sep 4   Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2020-24659. Received CVSS 7.5 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2020-24659. Public exploit reference added.

CWE-476, CWE-787 · CNA: mitre · CVSS v3.1 · 10 references · NVD status: Modified

Description

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 26, 2020	Reserved	Reserved by mitre
September 4, 2020	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2020-24659. Received CVSS 7.5 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2020-24659. Public exploit reference added.

Affected

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

Weaknesses

CWE-476 · CWE-787

References (10)

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html [Mailing List, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://gitlab.com/gnutls/gnutls/-/issues/1071 [Exploit, Issue Tracking, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
https://security.gentoo.org/glsa/202009-01 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20200911-0006/ [Third Party Advisory]
https://usn.ubuntu.com/4491-1/ [Third Party Advisory]
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04 [Vendor Advisory]

Authoritative record: CVE-2020-24659 at cve.org

Weaknesses: CWE-476 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-24659 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.