How severe is CVE-2012-4505?

CVE-2012-4505 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2012-4505 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-4505?

CVE-2012-4505 primarily affects Libproxy Project Libproxy. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-4505?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2012-4505 published?

CVE-2012-4505 was published on 2012-11-11 and last updated on 2026-06-16.

CVE-2012-4505

CVE-2012-4505 is a critical-severity vulnerability in Libproxy Project Libproxy with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Libproxy Project Libproxy
Published: 2012-11-11
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2012-4505?: CVE-2012-4505 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2012-4505 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-4505?: CVE-2012-4505 primarily affects Libproxy Project Libproxy. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-4505?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2012-4505 published?: CVE-2012-4505 was published on 2012-11-11 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:libproxy_project:libproxy:0.2.3:*:*:*:*:*:*:*
cpe:2.3:a:libproxy_project:libproxy:0.3.0:*:*:*:*:*:*:*
cpe:2.3:a:libproxy_project:libproxy:0.3.1:*:*:*:*:*:*:*

More vulnerabilities in Libproxy Project Libproxy

CVE-2012-4504 — Critical (CVSS 10.0): Stack-based buffer overflow in the url::get_pac function in url.cpp in libproxy 0.4.x before 0.4.9 allows remote…
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