CVE catalog

CVE-2023-21538

UBUNTU-CVE-2023-21538

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jan 10, 2023, 12:00:00 AM UTC
Updated: Feb 10, 2026, 4:42:55 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.84% · Oct 25, 2026

Johan Gorter discovered that .NET 6 incorrectly processed certain invalid HTTP requests. An attacker could possibly use this issue to cause a denial of service condition for an exposed endpoint.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Ubuntu	dotnet6	22.04	`6.0.108-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.109-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.110-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.111-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.113-0ubuntu1~22.04.1`	fixed
Ubuntu	dotnet6	22.04	`6.0.108-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.109-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.110-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.111-0ubuntu1~22.04.1`	vulnerable
Ubuntu	dotnet6	22.04	`6.0.113-0ubuntu1~22.04.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Ubuntu	dotnet6	deb	22.04	`6.0.113-0ubuntu1~22.04.1`	Not reported	USN-5798-1	Not reported
Ubuntu	dotnet6	deb	22.04	`6.0.113-0ubuntu1~22.04.1`	Not reported	UBUNTU-CVE-2023-21538	Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed: Oct 23, 2026, 6:24:19 PM UTC

References

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]