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9.3

Firefox, Thunderbird, SeaMonkey could let attackers run code

CVE-2012-1947 · published 14 years ago
Summary

Older versions of Firefox (4.x-12.0), Thunderbird (5.0-12.0) and SeaMonkey before 2.10 have a flaw that can be triggered by specially crafted web content, allowing a remote attacker to run any program on the computer. This happens because the software mishandles certain character‑set conversions, causing memory corruption. Upgrade to the latest releases of these browsers or apply the vendor's security patches to protect your systems.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mozilla firefox 4.0
4.0.1
5.0
5.0.1
6.0
6.0.1
6.0.2
7.0
7.0.1
8.0
8.0.1
9.0
8 more version ranges
cpe:2.3:a:mozilla:firefox:4.0:*:*:*:*:*:*:*
mozilla seamonkey <= 2.9
1.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
1.1
53 more version ranges
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
mozilla thunderbird 5.0
6.0
6.0.1
6.0.2
7.0
7.0.1
8.0
9.0
9.0.1
10.0
10.0.1
10.0.2
4 more version ranges
cpe:2.3:a:mozilla:thunderbird:5.0:*:*:*:*:*:*:*
mozilla thunderbird_esr 10.0
10.0.1
10.0.2
10.0.3
10.0.4
cpe:2.3:a:mozilla:thunderbird_esr:10.0:*:*:*:*:*:*:*
Original advisory text
Heap-based buffer overflow in the utf16_to_isolatin1 function in Mozilla Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.5, Thunderbird 5.0 through 12.0, Thunderbird ESR 10.x before 10.0.5, ...
Heap-based buffer overflow in the utf16_to_isolatin1 function in Mozilla Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.5, Thunderbird 5.0 through 12.0, Thunderbird ESR 10.x before 10.0.5, and SeaMonkey before 2.10 allows remote attackers to execute arbitrary code via vectors that trigger a character-set conversion failure.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
9.3 Critical
Exploitation
5% chance of attack within 30 days
Type
CWE-119Buffer Overflow
Timeline
Published5 Jun 2012
Updated24 Oct 2026
First seen29 Sep 2026
Sources
CVE-2012-1947 · NVD
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