CVE-2012-4505

Heap-based buffer overflow in the px_pac_reload function in lib/pac.c in libproxy 0.2.x and 0.3.x allows remote servers to have an unspecified impact via a crafted Content-Length size in an HTTP response header for a proxy.pac file request, a different vulnerability than CVE-2012-4504.

Published: 2012-11-11 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4505 is rated High Risk (65.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.37%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-4505

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 9.20% 4.37% -4.83%
2 2025-03-29 4.37% 9.20% +4.83%
3 2025-03-19 — 4.37% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4505

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2012-4505

OS Trackers for CVE-2012-4505

vendor priority summary link
debian not yet assigned CVE-2012-4505 not yet assigned priority: Debian including 1 source packages (libproxy), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-4505
redhat medium — https://access.redhat.com/security/cve/CVE-2012-4505
ubuntu medium CVE-2012-4505 medium priority: Ubuntu including 1 source packages (libproxy), 7 status rows across 7 suites (hardy, lucid, natty, oneiric, precise, quantal, upstream): not-affected 2, released 2, DNE 1, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2012-4505

Affected software / configurations for CVE-2012-4505

Vendor Product Version Raw CPE
libproxy_project libproxy 0.2.3 cpe:2.3:a:libproxy_project:libproxy:0.2.3:*:*:*:*:*:*:*
libproxy_project libproxy 0.3.0 cpe:2.3:a:libproxy_project:libproxy:0.3.0:*:*:*:*:*:*:*
libproxy_project libproxy 0.3.1 cpe:2.3:a:libproxy_project:libproxy:0.3.1:*:*:*:*:*:*:*

References for CVE-2012-4505

cvelogic Threat Intelligence