CVE-2009-2477

Exp

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.

Published: 2009-07-15 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-2477 is rated High Exploit Risk (81.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 42.69%, 99th percentile). 5 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2009-2477

EDB-ID Source Kind Published Link
40936 exploit_db edb 2016-12-18 Exploit-DB ↗
16299 exploit_db edb 2010-09-20 Exploit-DB ↗
9214 exploit_db edb 2009-07-20 Exploit-DB ↗
9137 exploit_db edb 2009-07-13 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2009-2477

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 83.31% 42.69% -40.62%
2 2026-02-05 83.03% 83.31% +0.27%
3 2025-03-30 — 83.03% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-2477

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2009-2477

OS Trackers for CVE-2009-2477

vendor priority summary link
gentoo high CVE-2009-2477: 1 GLSA(s) (201301-01), 14 atom(s) (dev-libs/nss, mail-client/mozilla-thunderbird, …); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-2477
redhat critical — https://access.redhat.com/security/cve/CVE-2009-2477
ubuntu medium CVE-2009-2477 medium priority: Ubuntu including 2 source packages (firefox-3.5, xulrunner-1.9.1), 10 status rows across 5 suites (dapper, hardy, intrepid, jaunty, upstream): DNE 6, released 3, needs-triage 1. https://ubuntu.com/security/CVE-2009-2477

Affected software / configurations for CVE-2009-2477

Vendor Product Version Raw CPE
mozilla firefox 3.5 cpe:2.3:a:mozilla:firefox:3.5:*:*:*:*:*:*:*

References for CVE-2009-2477

URL Tags
http://blog.mozilla.com/security/2009/07/14/critical-javascript-vulnerability-in-firefox-35/
http://isc.sans.org/diary.html?storyid=6796
http://secunia.com/advisories/35798 Vendor Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-66-266148-1
http://voices.washingtonpost.com/securityfix/2009/07/stopgap_fix_for_critical_firef.html
http://www.exploit-db.com/exploits/9137
http://www.exploit-db.com/exploits/9181
http://www.h-online.com/security/First-Zero-Day-Exploit-for-Firefox-3-5--/news/113761
http://www.kb.cert.org/vuls/id/443060 US Government Resource
http://www.mozilla.org/security/announce/2009/mfsa2009-41.html Patch Vendor Advisory
http://www.securityfocus.com/bid/35660 Exploit
http://www.vupen.com/english/advisories/2009/1868 Patch Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=503286
https://www.exploit-db.com/exploits/40936/
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html
cvelogic Threat Intelligence