CVE-2021-4209
gnutls28 - security update
6.5
MEDIUM
CVSS 3.1
EPSS 0.37%
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.
How to fix CVE-2021-4209
To remediate CVE-2021-4209, upgrade the affected package to a fixed version below.
- Debian/gnutls28—upgrade to 3.7.1-5+deb11u1 or later
- —upgrade to 3.6.7-4+deb10u9 or later
Is CVE-2021-4209 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 3.7.1-5+deb11u1
- from 0, < 3.6.7-4+deb10u9
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |