CVE-2021-4209
MEDIUM severity · CVSS 6.5 · CWE-476
6.5CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 ↗
Additional information
- NVD record
- https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568Patch
- https://access.redhat.com/security/cve/CVE-2021-4209Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2044156Advisory
- https://gitlab.com/gnutls/gnutls/-/issues/1306Advisory
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1503Advisory
- https://security.netapp.com/advisory/ntap-20220915-0005/Advisory