CVE-2015-4495

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 67%CVSS: 8.8Exploit: cisa kev · ssvc active · Metasploit · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
67%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

August 8, 2015

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated May 2, 2026
No patch confirmed yet.
generic
http://www.securityfocus.com/bid/76249
generic
http://rhn.redhat.com/errata/RHSA-2015-1581.html

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (39.0.3+build2-0ubuntu0.15.04.1) @ vivid2026-07-26ubuntu
redhatfirefox-0:38.1.1-1.ael7b_12015-08-07redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 67× in last 7d / 381× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 803 total refreshes for this CVE.

  1. 2026-07-27 09:12 UTCVendor advisory
  2. 2026-07-27 09:12 UTCGHSA enrichment
  3. 2026-07-27 05:26 UTCVendor advisory
  4. 2026-07-27 05:26 UTCGHSA enrichment
  5. 2026-07-27 01:37 UTCVendor advisory
  6. 2026-07-27 01:36 UTCGHSA enrichment
  7. 2026-07-26 21:49 UTCVendor advisory
  8. 2026-07-26 21:49 UTCGHSA enrichment
  9. 2026-07-26 18:03 UTCEG score recompute
  10. 2026-07-26 18:03 UTCVendor advisory
  11. 2026-07-26 18:02 UTCGHSA enrichment
  12. 2026-07-26 14:50 UTCEPSS rescore
  13. 2026-07-26 14:14 UTCEG score recompute
  14. 2026-07-26 14:14 UTCVendor advisory
  15. 2026-07-26 14:14 UTCGHSA enrichment
  16. 2026-07-26 10:27 UTCVendor advisory
  17. 2026-07-26 10:27 UTCGHSA enrichment
  18. 2026-07-26 06:28 UTCVendor advisory
  19. 2026-07-26 06:28 UTCGHSA enrichment
  20. 2026-07-26 02:38 UTCEG score recompute
  21. 2026-07-26 02:38 UTCVendor advisory
  22. 2026-07-26 02:38 UTCGHSA enrichment
  23. 2026-07-24 14:13 UTCEPSS rescore
  24. 2026-07-23 01:18 UTCEG score recompute
  25. 2026-07-23 00:21 UTCVendor advisory
Show 75 more
  1. 2026-07-23 00:21 UTCGHSA enrichment
  2. 2026-07-23 00:20 UTCEG score recompute
  3. 2026-07-22 21:58 UTCEG score recompute
  4. 2026-07-22 20:35 UTCVendor advisory
  5. 2026-07-22 20:34 UTCGHSA enrichment
  6. 2026-07-22 19:40 UTCCISA KEV update
  7. 2026-07-22 16:46 UTCEG score recompute
  8. 2026-07-22 16:46 UTCVendor advisory
  9. 2026-07-22 16:46 UTCGHSA enrichment
  10. 2026-07-22 14:04 UTCEPSS rescore
  11. 2026-07-22 12:59 UTCVendor advisory
  12. 2026-07-22 12:58 UTCGHSA enrichment
  13. 2026-07-22 09:11 UTCVendor advisory
  14. 2026-07-22 09:11 UTCGHSA enrichment
  15. 2026-07-22 05:24 UTCVendor advisory
  16. 2026-07-22 05:24 UTCGHSA enrichment
  17. 2026-07-22 01:11 UTCVendor advisory
  18. 2026-07-22 01:11 UTCGHSA enrichment
  19. 2026-07-21 20:48 UTCVendor advisory
  20. 2026-07-21 20:48 UTCGHSA enrichment
  21. 2026-07-21 16:58 UTCEG score recompute
  22. 2026-07-21 16:58 UTCVendor advisory
  23. 2026-07-21 16:58 UTCGHSA enrichment
  24. 2026-07-21 15:21 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
  26. 2026-07-21 14:37 UTCCISA KEV update
  27. 2026-07-21 13:10 UTCVendor advisory
  28. 2026-07-21 13:10 UTCGHSA enrichment
  29. 2026-07-21 09:23 UTCVendor advisory
  30. 2026-07-21 09:23 UTCGHSA enrichment
  31. 2026-07-21 05:36 UTCVendor advisory
  32. 2026-07-21 05:36 UTCGHSA enrichment
  33. 2026-07-21 01:49 UTCVendor advisory
  34. 2026-07-21 01:48 UTCGHSA enrichment
  35. 2026-07-20 22:02 UTCVendor advisory
  36. 2026-07-20 22:01 UTCGHSA enrichment
  37. 2026-07-20 18:15 UTCEG score recompute
  38. 2026-07-20 18:15 UTCVendor advisory
  39. 2026-07-20 18:15 UTCGHSA enrichment
  40. 2026-07-20 17:03 UTCEPSS rescore
  41. 2026-07-20 14:26 UTCVendor advisory
  42. 2026-07-20 14:26 UTCGHSA enrichment
  43. 2026-07-20 10:40 UTCVendor advisory
  44. 2026-07-20 10:39 UTCGHSA enrichment
  45. 2026-07-20 06:53 UTCVendor advisory
  46. 2026-07-20 06:52 UTCGHSA enrichment
  47. 2026-07-20 03:05 UTCVendor advisory
  48. 2026-07-20 03:05 UTCGHSA enrichment
  49. 2026-07-19 23:18 UTCVendor advisory
  50. 2026-07-19 23:18 UTCGHSA enrichment
  51. 2026-07-19 19:31 UTCVendor advisory
  52. 2026-07-19 19:31 UTCGHSA enrichment
  53. 2026-07-19 15:44 UTCVendor advisory
  54. 2026-07-19 15:44 UTCGHSA enrichment
  55. 2026-07-19 11:58 UTCVendor advisory
  56. 2026-07-19 11:58 UTCGHSA enrichment
  57. 2026-07-19 08:11 UTCVendor advisory
  58. 2026-07-19 08:11 UTCGHSA enrichment
  59. 2026-07-19 04:24 UTCEG score recompute
  60. 2026-07-19 04:24 UTCVendor advisory
  61. 2026-07-19 04:24 UTCGHSA enrichment
  62. 2026-07-19 02:26 UTCEPSS rescore
  63. 2026-07-19 02:26 UTCEPSS rescore
  64. 2026-07-19 00:37 UTCVendor advisory
  65. 2026-07-19 00:36 UTCGHSA enrichment
  66. 2026-07-18 20:48 UTCVendor advisory
  67. 2026-07-18 20:47 UTCGHSA enrichment
  68. 2026-07-18 17:01 UTCVendor advisory
  69. 2026-07-18 17:00 UTCGHSA enrichment
  70. 2026-07-18 13:13 UTCVendor advisory
  71. 2026-07-18 13:13 UTCGHSA enrichment
  72. 2026-07-18 09:26 UTCVendor advisory
  73. 2026-07-18 09:26 UTCGHSA enrichment
  74. 2026-07-18 05:39 UTCVendor advisory
  75. 2026-07-18 05:39 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-37772
    First seen Aug 15, 2015

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

    Open source ↗
  • Metasploitauxiliary/gather/firefox_pdfjs_file_theft✓ verified
    First seen Jan 1, 2015

    Firefox PDF.js Browser File Theft

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2015-4495?
CVE-2015-4495 is a critical vulnerability published on August 8, 2015. 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…
When was CVE-2015-4495 disclosed?
CVE-2015-4495 was first published in the National Vulnerability Database on August 8, 2015, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-4495 actively exploited?
Yes. CISA added CVE-2015-4495 to the Known Exploited Vulnerabilities catalog on May 25, 2022, affecting Mozilla Firefox. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2015-4495?
CVE-2015-4495 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2015-4495?
CVE-2015-4495 affects Mozilla Firefox. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2015-4495?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4495, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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