4.3

CVE-2011-4317: apache http_server Improper Input Validation

CVSS: 4.3v2.0MediumModified
AliasesDEBIAN-CVE-2011-4317
Published 30-11-2011Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2011-4317 is a medium (CVSS 4.3) Improper Input Validation vulnerability in apache http_server. EPSS estimates a 59.63% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities. 3 public exploits are recorded.

Overall risk
39/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v2.0 (NVD)
EPSS score
59.63%
0%100%
Critical · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits3reference, exploit-database

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
DSA-2405-1OPENSUSE-SU-2024:10268-1RHSA-2012:0128

Timeline

  1. 30-11-2011
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

59.63%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

+0.03 pp

From 59.60% on 20-09-2026

20-09-202620-10-2026
EPSS score
59.63%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

3 found
  • referenceUnverified

    Exploit Reference (community.qualys.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (thread.gmane.org)

    Maturity: unknown

  • exploit-databaseremotelinuxVerified

    Apache 7.0.x mod_proxy - Reverse Proxy Security Bypass

    Maturity: weaponized

Weaknesses

CWE · root cause

Affected systems

Apache1 product
  • http_serverEOL1.3 | 1.3.0 | 1.3.1 | 1.3.11 | 1.3.2 | 1.3.3 | 1.3.4 | 1.3.5 | 1.3.6 | 1.3.7 | 1.3.8 | 1.3.9 | 1.3.10 | 1.3.12 | 1.3.13 | 1.3.14 | 1.3.15 | 1.3.16 | 1.3.17 | 1.3.18 | 1.3.19 | 1.3.20 | 1.3.22 | 1.3.23 | 1.3.24 | 1.3.25 | 1.3.26 | 1.3.27 | 1.3.28 | 1.3.29 | 1.3.30 | 1.3.31 | 1.3.32 | 1.3.33 | 1.3.34 | 1.3.35 | 1.3.36 | 1.3.37 | 1.3.38 | 1.3.39 | 1.3.41 | 1.3.42 | 1.3.65 | 1.3.68 | 2.0 | 2.0.9 | 2.0.28 | 2.0.28:beta | 2.0.32 | 2.0.32:beta | 2.0.34:beta | 2.0.35 | 2.0.36 | 2.0.37 | 2.0.38 | 2.0.39 | 2.0.40 | 2.0.41 | 2.0.42 | 2.0.43 | 2.0.44 | 2.0.45 | 2.0.46 | 2.0.47 | 2.0.48 | 2.0.49 | 2.0.50 | 2.0.51 | 2.0.52 | 2.0.53 | 2.0.54 | 2.0.55 | 2.0.56 | 2.0.57 | 2.0.58 | 2.0.59 | 2.0.60 | 2.0.61 | 2.0.63 | 2.0.64 | 2.2.0 | 2.2.1 | 2.2.2 | 2.2.3 | 2.2.4 | 2.2.6 | 2.2.8 | 2.2.9 | 2.2.10 | 2.2.11 | 2.2.12 | 2.2.13 | 2.2.14 | 2.2.15 | 2.2.16 | 2.2.18 | 2.2.19 | 2.2.20 | 2.2.21
Debian1 product
  • apache2< 2.2.21-3

2 vendors · 2 products

References

34 links
Show all 34 references