CVE-2009-2477

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 43%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a document containing P and FONT elements.

CVSS v3
—
EG Score
0.0(none)
EPSS
98.5%
KEV
Not listed

Published

July 15, 2009

Last Modified

April 23, 2026

References (30)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 30× 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.

  1. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-05 02:26 UTCEPSS rescore
  3. 2026-07-05 02:26 UTCEPSS rescore
  4. 2026-07-01 15:02 UTCEPSS rescore
  5. 2026-06-29 14:02 UTCEPSS rescore
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  7. 2026-06-28 14:03 UTCEPSS rescore
  8. 2026-06-28 04:52 UTCEPSS rescore
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  10. 2026-06-27 03:05 UTCEPSS rescore
  11. 2026-06-25 13:46 UTCEPSS rescore
  12. 2026-06-25 13:46 UTCEPSS rescore
  13. 2026-06-23 21:29 UTCEPSS rescore
  14. 2026-06-23 21:29 UTCEPSS rescore
  15. 2026-06-22 14:22 UTCEPSS rescore
  16. 2026-06-22 14:22 UTCEPSS rescore
  17. 2026-06-21 01:56 UTCEPSS rescore
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  19. 2026-06-18 17:49 UTCEPSS rescore
  20. 2026-06-18 17:49 UTCEPSS rescore
  21. 2026-06-17 17:49 UTCEPSS rescore
  22. 2026-06-17 17:49 UTCEPSS rescore
  23. 2026-06-16 17:49 UTCEPSS rescore
  24. 2026-06-16 17:49 UTCEPSS rescore
  25. 2026-06-15 17:44 UTCEPSS rescore
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  1. 2026-06-14 23:14 UTCEPSS rescore
  2. 2026-06-14 23:14 UTCEPSS rescore
  3. 2026-06-12 23:08 UTCEPSS rescore
  4. 2026-06-12 23:08 UTCEPSS rescore
  5. 2026-06-10 22:14 UTCEPSS rescore
  6. 2026-06-06 13:44 UTCEPSS rescore
  7. 2026-06-06 13:44 UTCEPSS rescore
  8. 2026-06-06 13:44 UTCEPSS rescore
  9. 2026-06-05 22:44 UTCEPSS rescore
  10. 2026-06-05 22:44 UTCEPSS rescore
  11. 2026-06-05 06:07 UTCEPSS rescore
  12. 2026-06-04 13:09 UTCEPSS rescore
  13. 2026-06-04 13:09 UTCEPSS rescore
  14. 2026-06-02 20:10 UTCEPSS rescore
  15. 2026-06-02 20:10 UTCEPSS rescore
  16. 2026-05-31 22:28 UTCEPSS rescore
  17. 2026-05-31 22:28 UTCEPSS rescore
  18. 2026-05-31 00:13 UTCEPSS rescore
  19. 2026-05-31 00:13 UTCEPSS rescore
  20. 2026-05-30 16:07 UTCEG score recompute
  21. 2026-05-30 16:07 UTCGHSA enrichment
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-26 07:16 UTCEPSS rescore
  26. 2026-05-26 07:16 UTCEPSS rescore
  27. 2026-05-20 22:37 UTCEPSS rescore
  28. 2026-05-20 22:37 UTCEPSS rescore
  29. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (4 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-40936✓ verified
    First seen Dec 18, 2016

    Naenara Browser 3.5 (RedStar 3.0 Desktop) - 'JACKRABBIT' Client-Side Command Execution

    Open source ↗
  • Exploit-DBEDB-16299✓ verified
    First seen Sep 20, 2010

    Mozilla Firefox 3.5 - 'escape()' Return Value Memory Corruption (Metasploit)

    Open source ↗
  • Exploit-DBEDB-9214✓ verified
    First seen Jul 20, 2009

    Mozilla Firefox 3.5 - 'Font tags' Remote HeapSpray (2)

    Open source ↗
  • Exploit-DBEDB-9137✓ verified
    First seen Jul 13, 2009

    Mozilla Firefox 3.5 - Font tags Remote Buffer Overflow

    Open source ↗
  • Metasploitexploit/multi/browser/firefox_escape_retval✓ verified
    First seen Jul 13, 2009

    Firefox 3.5 escape() Return Value Memory Corruption

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-2477?
CVE-2009-2477 is a none vulnerability published on July 15, 2009. js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a…
When was CVE-2009-2477 disclosed?
CVE-2009-2477 was first published in the National Vulnerability Database on July 15, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-2477 actively exploited?
CVE-2009-2477 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-2477?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-2477, 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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