How severe is CVE-2015-4495?

CVE-2015-4495 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2015-4495?

Affected package information for CVE-2015-4495 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2015-4495?

No fixed version has been published for CVE-2015-4495 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2015-4495 actively exploited in the wild?

Yes. There are 6 known exploit references for CVE-2015-4495, including 1 documented proof-of-concept exploit on Exploit-DB and 5 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2015-4495?

CVE-2015-4495 has an EPSS (Exploit Prediction Scoring System) score of 71.6%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2015-4495 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2015-4495 (Mozilla Firefox Security Feature Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-05-25. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-06-15. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2015-4495?

CVE-2015-4495 is classified as CWE-346 (CWE-346). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2015-4495 published, and has it been updated?

CVE-2015-4495 was published on August 8, 2015 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-05-25 — agencies required to remediate by 2022-06-15

CVE-2015-4495

HIGH

Published

Aug 8, 2015

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

6 known

EPSS Exploitation Probability

via FIRST.org ↗

71.6%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the Same Origin Policy, and read arbitrary files or gain privileges, via vectors involving crafted JavaScript code and a native setter, as exploited in the wild in August 2015.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-37772localmultiple

Mozilla Firefox < 39.03 - 'pdf.js' Same Origin Policy

by Tantaryu MING · Aug 15, 2015

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2015-4495 in your stack?

O3 detects CVE-2015-4495 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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