NULL pointer dereference in GNU Gnutls
CVE-2021-4209
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.019 (79.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.019 · change: +0.002
Affected products
- GNU Gnutls
- NetApp Active Iq Unified Manager
- NetApp Hci Bootstrap OS
- NetApp Hci Compute Node
- NetApp Solidfire \& Hci Management Node
- Red Hat Enterprise Linux — versions 8.0
- Gnutls — versions Fixed in gnutls v3.7.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/gnutls/gnutls/-/issues/1306 (Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-4209 (Third Party Advisory)
- gitlab.com/gnutls/gnutls/-/merge_requests/1503 (Third Party Advisory)
- gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 (Patch, Third Party Advisory)
- security.netapp.com/advisory/ntap-20220915-0005/ (Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2021-4209?
- CVE-2021-4209 is a medium-severity vulnerability in GNU Gnutls, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-08-24.
- How severe is CVE-2021-4209?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-4209 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.