CVE-2011-4317

mediumpriority · attend · 48EPSS 0.596 · 99 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

59.6% (99th) EPSS

CVSS 4.3 · medium

Is it mine?

99 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:N/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-36352Apache 7.0.x mod_proxy - Reverse Proxy Security Bypassfunctional · exploit_db

affected products (99)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache http server= 1.3nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.0nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.1nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.1.1nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.10nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.11nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.12nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.13nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.14nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.15nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.16nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.17nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.18nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.19nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.2nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.20nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.22nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.23nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.24nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

showing 20 of 99

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2011-11-30modified 2026-06-16

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+25125 more

references (100)

External citations — patches, advisories, analysis.

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