SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2012-3993

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 does not properly interact with failures of…

EXPLOIT ✓HIGH 9.3EPSS 42.6%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 42.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 does not properly interact with failures of InstallTrigger methods, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted web site, related to an "XrayWrapper pollution" issue.

CVSS 2.0
9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
42.61% probability · 99th percentile
Public exploits
1 in Exploit-DB · verified · first 6 August 2013
CISA KEV
Not listed
Weakness
CWE-269
Affected
mozilla/firefox · mozilla/thunderbird esr · mozilla/thunderbird · mozilla/seamonkey
Source
cve@mitre.org
EPSS trend
0%23%45%4 November 2026: 42.61%4 November 20264 November 2026

EPSS 42.6% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-30474source ↗Mozilla Firefox 5.0 < 15.0.1 - __exposedProps__ XCS Code Execution (Metasploit)multiple · Metasploitlocal6 August 2013yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.