Vulnerability 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".
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | >= 2.4.26, < 2.4.64 |
Related Weaknesses (CWE)
References
- https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
- http://www.openwall.com/lists/oss-security/2025/07/10/2
- http://www.openwall.com/lists/oss-security/2025/07/10/7
- https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html
FAQ
What is CVE-2025-49630?
CVE-2025-49630 is a vulnerability with a CVSS score of 7.5 (HIGH). 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. ...
How severe is CVE-2025-49630?
CVE-2025-49630 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-49630?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.