$ cve CVE-2011-4317 JSON

CVE-2011-4317 EXPLOIT

4.3

MEDIUM · CVSS 2.0 · EPSS 59.6% (pctl 99)

Patch early

A public exploit exists.

Description

The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.

Scoring

CVSS	4.3 (MEDIUM, v2.0)
Vector	AV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS	59.6% — more likely to be exploited than 99% of all CVEs
Weakness	CWE-20
On CISA KEV	no
Public exploit	yes
Published	2011-11-30
Last modified	2026-06-16

Affected (1)

Vendor	Product
apache	http server

Public exploits

Source	Title	Date
exploit-db	Apache 7.0.x mod_proxy - Reverse Proxy Security Bypass	2011-11-24

References

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