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CVE-2013-2503

33
FAUCET Score

CVE-2013-2503 describes a vulnerability in Privoxy versions prior to 3.0.21, where improper handling of Proxy-Authenticate and Proxy-Authorization headers allows remote HTTP servers to spoof the intended proxy service using a 407 HTTP status code. This medium-severity vulnerability (CVSS 5.8) has a network attack vector and medium attack complexity, potentially leading to partial confidentiality and integrity impacts. While there is no evidence of active exploitation or Metasploit/Nuclei modules, an ExploitDB entry (EDB-38377) exists for authentication information disclosure, and it has received minimal community or media attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.20CPE matchmatch criteria
cpe:2.3:a:privoxy:privoxy:*:beta:*:*:*:*:*:*
2.9.0CPE matchmatch criteria
cpe:2.3:a:privoxy:privoxy:2.9.0:pre-alpha:*:*:*:*:*:*
2.9.1CPE matchmatch criteria
cpe:2.3:a:privoxy:privoxy:2.9.1:pre-alpha:*:*:*:*:*:*
2.9.2CPE matchmatch criteria
cpe:2.3:a:privoxy:privoxy:2.9.2:pre-alpha:*:*:*:*:*:*
2.9.3CPE matchmatch criteria
cpe:2.3:a:privoxy:privoxy:2.9.3:pre-alpha:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.63%
Probability of exploitation in next 30 days
EPSS Percentile
90.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-38377 · Mar 11, 2013
This CVE's current EPSS score of 0.0463 is in the 88th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: privoxy

Vendor Advisories (1)

redhatCVE-2013-2503Low

privoxy: Proxy-Authentication response spoofing

Mar 11, 2013

References

blog.c22.cc / 2013/03/11/privoxy-proxy-authentication-credential-exposure-cve-2013-2503
Exploit
ijbswa.cvs.sourceforge.net / viewvc/ijbswa/current/ChangeLog
lists.opensuse.org / opensuse-updates/2013-03/msg00118.html