CVE-2025-49630

Name: CVE-2025-49630
Creator: NVD / NIST
Published: 2025-07-10T17:15:48.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2025-49630 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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".. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

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".

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.15%

62.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions
Apache	Http Server	>= 2.4.26, < 2.4.64

References

Timeline

Published: Jul 10, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-49630?

How severe is CVE-2025-49630?

CVE-2025-49630 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2025-49630?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-49630?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST