CVE-2025-49630

Publication date 10 July 2025

Last updated 16 July 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	25.04 plucky	Fixed 2.4.63-1ubuntu1.1
	24.04 LTS noble	Fixed 2.4.58-1ubuntu8.7
	22.04 LTS jammy	Fixed 2.4.52-1ubuntu4.15
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: 8830432

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7639-1
Apache HTTP Server vulnerabilities
16 July 2025