The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, 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 by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
Published 2011-11-30 04:05:58
Updated 2023-02-13 04:32:41
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Input validation

Threat overview for CVE-2011-3639

Top countries where our scanners detected CVE-2011-3639
Top open port discovered on systems with this issue 80
IPs affected by CVE-2011-3639 781,257
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2011-3639!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2011-3639

Probability of exploitation activity in the next 30 days: 3.51%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 91 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2011-3639

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.3
MEDIUM AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
NIST

CWE ids for CVE-2011-3639

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2011-3639

Products affected by CVE-2011-3639

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