| Name | CVE-2021-4209 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3070-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| gnutls28 (PTS) | bullseye | 3.7.1-5+deb11u5 | fixed |
| bullseye (security) | 3.7.1-5+deb11u7 | fixed |
| bookworm, bookworm (security) | 3.7.9-2+deb12u4 | fixed |
| trixie, sid | 3.8.9-2 | fixed |
The information below is based on the following data on fixed versions.
Notes
[stretch] - gnutls28 <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2044156
https://gitlab.com/gnutls/gnutls/-/issues/1306
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
Fixed by: https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 (3.7.3)