CVE-2025-49630

CWE-617 — Reachable Assertion11 documents8 sources
Severity
7.5HIGH
EPSS
1.0%
top 22.54%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Apache Http ServerApache Software Foundation Apache Http Server
Timeline
PublishedJul 10
Latest updateAug 19

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages5 packages

▶NVDapache/http_server2.4.26 — 2.4.64
▶Alpineapache2< 2.4.64-r0+4
▶Debianapache2< 2.4.65-1~deb11u1+3
▶Ubuntuapache2< 2.4.18-2ubuntu3.17+esm16+2

🔴Vulnerability Details

5
OSV
apache2 vulnerabilities↗2025-08-19
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OSV
CVE-2025-49630: In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2↗2025-07-10
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OSV
CVE-2025-49630: In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2↗2025-07-10
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GHSA
GHSA-72h2-3r97-f454: In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2↗2025-07-10
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CVEList
Apache HTTP Server: mod_proxy_http2 denial of service↗2025-07-10
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📋Vendor Advisories

5
Ubuntu
Apache HTTP Server vulnerabilities↗2025-08-19
▶
Ubuntu
Apache HTTP Server vulnerabilities↗2025-07-16
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Red Hat
httpd: mod_proxy_http2: untrusted input from a client causes an assertion to fail in the Apache mod_proxy_http2 module↗2025-07-14
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Microsoft
Apache HTTP Server: mod_proxy_http2 denial of service↗2025-07-08
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Debian
CVE-2025-49630: apache2 - In certain proxy configurations, a denial of service attack against Apache HTTP ...↗2025
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