CVE-2009-2477

highpriority · attend · 62EPSS 0.425 · 99 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

5 exploits · functional

Likely / severe?

42.5% (99th) EPSS

CVSS 9.3 · high

Is it mine?

2 products

Check your exposure

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:C/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USprimary

exploits (5)

Public proof-of-concept and weaponised exploit code.

EDB-16299Mozilla Firefox 3.5 - 'escape()' Return Value Memory Corruption (Metasploit)functional · exploit_db
EDB-40936Naenara Browser 3.5 (RedStar 3.0 Desktop) - 'JACKRABBIT' Client-Side Command Executionfunctional · exploit_db
EDB-9137Mozilla Firefox 3.5 - Font tags Remote Buffer Overflowfunctional · exploit_db
EDB-9214Mozilla Firefox 3.5 - 'Font tags' Remote HeapSpray (2)functional · exploit_db
exploit/multi/browser/firefox_escape_retvalFirefox 3.5 escape() Return Value Memory Corruptionfunctional · metasploit

affected products (2)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
mozilla firefox= 3.5nvdUScpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd NVD CVE.org MITRE

published 2009-07-15modified 2026-06-16

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+10437 more

references (30)

External citations — patches, advisories, analysis.

scry

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