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 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.

Published: 2014-02-05 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4449 is rated Moderate Risk (47/100): CVSS Medium severity, with high exploitation likelihood (EPSS 68.75%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-4449

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-10-07 73.42% 68.75% -4.67%
2 2025-10-03 71.81% 73.42% +1.61%
3 2025-07-11 — 71.81% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4449

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2013-4449

OS Trackers for CVE-2013-4449

vendor priority summary link
debian low CVE-2013-4449 low priority: Debian including 1 source packages (openldap), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-4449
redhat medium — https://access.redhat.com/security/cve/CVE-2013-4449
ubuntu low CVE-2013-4449 low priority: Ubuntu including 1 source packages (openldap), 9 status rows across 9 suites (lucid, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid): released 5, ignored 4. https://ubuntu.com/security/CVE-2013-4449

Affected software / configurations for CVE-2013-4449

Vendor Product Version Raw CPE
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
openldap openldap <= 2.4.36 cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:*
openldap openldap 2.4.6 cpe:2.3:a:openldap:openldap:2.4.6:*:*:*:*:*:*:*
openldap openldap 2.4.7 cpe:2.3:a:openldap:openldap:2.4.7:*:*:*:*:*:*:*
openldap openldap 2.4.8 cpe:2.3:a:openldap:openldap:2.4.8:*:*:*:*:*:*:*
openldap openldap 2.4.9 cpe:2.3:a:openldap:openldap:2.4.9:*:*:*:*:*:*:*
openldap openldap 2.4.10 cpe:2.3:a:openldap:openldap:2.4.10:*:*:*:*:*:*:*
openldap openldap 2.4.11 cpe:2.3:a:openldap:openldap:2.4.11:*:*:*:*:*:*:*
openldap openldap 2.4.12 cpe:2.3:a:openldap:openldap:2.4.12:*:*:*:*:*:*:*
openldap openldap 2.4.13 cpe:2.3:a:openldap:openldap:2.4.13:*:*:*:*:*:*:*
openldap openldap 2.4.14 cpe:2.3:a:openldap:openldap:2.4.14:*:*:*:*:*:*:*
openldap openldap 2.4.15 cpe:2.3:a:openldap:openldap:2.4.15:*:*:*:*:*:*:*
openldap openldap 2.4.16 cpe:2.3:a:openldap:openldap:2.4.16:*:*:*:*:*:*:*
openldap openldap 2.4.17 cpe:2.3:a:openldap:openldap:2.4.17:*:*:*:*:*:*:*
openldap openldap 2.4.18 cpe:2.3:a:openldap:openldap:2.4.18:*:*:*:*:*:*:*
openldap openldap 2.4.19 cpe:2.3:a:openldap:openldap:2.4.19:*:*:*:*:*:*:*
openldap openldap 2.4.20 cpe:2.3:a:openldap:openldap:2.4.20:*:*:*:*:*:*:*
openldap openldap 2.4.21 cpe:2.3:a:openldap:openldap:2.4.21:*:*:*:*:*:*:*
openldap openldap 2.4.22 cpe:2.3:a:openldap:openldap:2.4.22:*:*:*:*:*:*:*
openldap openldap 2.4.23 cpe:2.3:a:openldap:openldap:2.4.23:*:*:*:*:*:*:*
openldap openldap 2.4.24 cpe:2.3:a:openldap:openldap:2.4.24:*:*:*:*:*:*:*
openldap openldap 2.4.25 cpe:2.3:a:openldap:openldap:2.4.25:*:*:*:*:*:*:*
openldap openldap 2.4.26 cpe:2.3:a:openldap:openldap:2.4.26:*:*:*:*:*:*:*
openldap openldap 2.4.27 cpe:2.3:a:openldap:openldap:2.4.27:*:*:*:*:*:*:*
openldap openldap 2.4.28 cpe:2.3:a:openldap:openldap:2.4.28:*:*:*:*:*:*:*
openldap openldap 2.4.29 cpe:2.3:a:openldap:openldap:2.4.29:*:*:*:*:*:*:*
openldap openldap 2.4.30 cpe:2.3:a:openldap:openldap:2.4.30:*:*:*:*:*:*:*
openldap openldap 2.4.31 cpe:2.3:a:openldap:openldap:2.4.31:*:*:*:*:*:*:*
openldap openldap 2.4.32 cpe:2.3:a:openldap:openldap:2.4.32:*:*:*:*:*:*:*
openldap openldap 2.4.33 cpe:2.3:a:openldap:openldap:2.4.33:*:*:*:*:*:*:*
openldap openldap 2.4.34 cpe:2.3:a:openldap:openldap:2.4.34:*:*:*:*:*:*:*
openldap openldap 2.4.35 cpe:2.3:a:openldap:openldap:2.4.35:*:*:*:*:*:*:*

References for CVE-2013-4449

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