NULL pointer dereference in GNU Gnutls
CVE-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, where the gnutls_deinit function is called after detecting a handshake failure.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.037 (89.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000
Affected products
- GNU Gnutls
- Canonical Ubuntu Linux — versions 20.04
- Fedoraproject Fedora — versions 32, 33
- openSUSE Leap — versions 15.1, 15.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/gnutls/gnutls/-/issues/1071 (Exploit, Third Party Advisory, Issue Tracking)
- www.gnutls.org/security-new.html (Vendor Advisory)
- security.gentoo.org/glsa/202009-01 (vendor-advisory, Third Party Advisory)
- security.netapp.com/advisory/ntap-20200911-0006/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- usn.ubuntu.com/4491-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-24659?
- CVE-2020-24659 is a high-severity vulnerability in GNU Gnutls, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2020-09-04.
- How severe is CVE-2020-24659?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-24659 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.