THREATPORT/VULNERABILITY/CVE-2020-24659
HIGH SEVERITY

CVE-2020-24659

Gnutls vulnerability

CVSS
7.5
EPSS
3.7%
EPSS pct
89th
Exploited
No known
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.
Affected vendor
Gnu
Affected product
Gnutls
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
Published
2020-09-04

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2020-24659

  • Confirm whether Gnu Gnutls is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-24659.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-24659

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-24659 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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