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Vulnerabilities

Vulnerability · CVE-2020-24659

An issue was discovered in GnuTLS before 3.6.15.

Published Sep 4, 2020 · catalog updated Oct 14, 2026 · An issue was discovered

Check if you run it

No confirmed exploitation is on record for CVE-2020-24659. EPSS is 3.83%. Act only if a listed version of An issue was discovered is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An issue was discovered).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.83%
Remediation
Advisory link
Affected products
cpe canonical/ubuntu linux · cpe fedoraproject/fedora · cpe gnu/gnutls · cpe opensuse/leap

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe canonical/ubuntu linux20.04
  • cpe fedoraproject/fedora32
  • cpe fedoraproject/fedora33
  • cpe gnu/gnutlsversion unspecified
  • cpe opensuse/leap15.1
  • cpe opensuse/leap15.2

How to fix CVE-2020-24659

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-24659. EPSS is 3.83%. Act only if a listed version of An issue was discovered is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 20.04. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference; CWE-787: Out-of-bounds Write. EPSS 3.83%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 4, 2020 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2020-24659

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-24659

    30-day exploitation probability 3.8%

    first.org
  • NIST NVDVulnerability recordCVE-2020-24659

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.