CVE-2015-4495
Mozilla Firefox Security Feature Bypass Vulnerability
- High 8.8
- Exploited: added to CISA KEV 25 May 2022
- A public exploit reference is listed
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.
Key facts
- Published
- 8 Aug 2015
- Last changed
- 21 Oct 2025
- Assigned by
- mozilla
- KEV added
- 25 May 2022
- KEV fix due
- 15 Jun 2022
- EPSS
- 68.558% likely to be exploited in the next 30 days, higher than 99.351% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 8 Aug 2015 Published
- 25 May 2022 CVE-2015-4495 added to CISA KEV
- 25 May 2022 Added to the CISA KEV catalogue