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Vulnerability · Published Aug 24, 2022 · Assigned by redhat

CVE-2021-4209

Medium 6.5

In plain English

A medium-severity null pointer dereference in GnuTLS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.9%top 20.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12gnutls283.7.3-2DEBIAN-CVE-2021-4209
Debian:13gnutls283.7.3-2DEBIAN-CVE-2021-4209
Debian:14gnutls283.7.3-2DEBIAN-CVE-2021-4209
Ubuntu:22.04:LTSgnutls283.7.3-4ubuntu1.1USN-5550-1

Affected products (as reported)

VendorProductVersions
n/a GnuTLS Fixed in gnutls v3.7.3

Weakness: CWE-476

References