CVE-2015-4495

CVE-2015-4495 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-05-25). The underlying weakness is classified as CWE-346.

Key facts

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.

Frequently asked questions

What is CVE-2015-4495?
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.
How severe is CVE-2015-4495?
CVE-2015-4495 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-4495 being actively exploited?
Yes. CVE-2015-4495 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-05-25, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2015-4495?
CVE-2015-4495 primarily affects Mozilla Firefox. In total, 49 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-4495?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2015-4495 have an EU (EUVD) identifier?
Yes. CVE-2015-4495 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2015-4515. It is also flagged as exploited in the EUVD (since 2022-05-25).
When was CVE-2015-4495 published?
CVE-2015-4495 was published on 2015-08-08 and last updated on 2026-06-17.

References

Affected products (49)

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