CVE-2011-1024
Status: ModifiedMedium (4.6)—
chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (aka authentication-failure forwarding) is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server.
CVSS
- Version: 2.0
- Vector: AV:N/AC:H/Au:S/C:P/I:P/A:P
- Base score: 4.6
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 2.59%
- Percentile among all scored CVEs: 85
- Score date: 10/7/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- CWE-264
References
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735
- http://openwall.com/lists/oss-security/2011/02/24/12
- http://openwall.com/lists/oss-security/2011/02/25/13
- http://secunia.com/advisories/43331
- http://secunia.com/advisories/43708
- http://secunia.com/advisories/43718
- http://security.gentoo.org/glsa/glsa-201406-36.xml
- http://securitytracker.com/id?1025188
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:055
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:056
- http://www.openldap.org/devel/cvsweb.cgi/servers/slapd/back-ldap/chain.c.diff?r1=1.76&r2=1.77&hideattic=1&sortbydate=0
- http://www.openldap.org/its/index.cgi/Software%20Bugs?id=6607
- http://www.openldap.org/lists/openldap-announce/201102/msg00000.html
- http://www.openldap.org/lists/openldap-technical/201004/msg00247.html
- http://www.redhat.com/support/errata/RHSA-2011-0346.html
- http://www.redhat.com/support/errata/RHSA-2011-0347.html
- http://www.ubuntu.com/usn/USN-1100-1
- http://www.vupen.com/english/advisories/2011/0665
- https://bugzilla.novell.com/show_bug.cgi?id=674985
- https://bugzilla.redhat.com/show_bug.cgi?id=680466
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735
- http://openwall.com/lists/oss-security/2011/02/24/12
- http://openwall.com/lists/oss-security/2011/02/25/13
- http://secunia.com/advisories/43331
- http://secunia.com/advisories/43708
- http://secunia.com/advisories/43718
- http://security.gentoo.org/glsa/glsa-201406-36.xml
- http://securitytracker.com/id?1025188
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:055
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:056
- http://www.openldap.org/devel/cvsweb.cgi/servers/slapd/back-ldap/chain.c.diff?r1=1.76&r2=1.77&hideattic=1&sortbydate=0
- http://www.openldap.org/its/index.cgi/Software%20Bugs?id=6607
- http://www.openldap.org/lists/openldap-announce/201102/msg00000.html
- http://www.openldap.org/lists/openldap-technical/201004/msg00247.html
- http://www.redhat.com/support/errata/RHSA-2011-0346.html
- http://www.redhat.com/support/errata/RHSA-2011-0347.html
- http://www.ubuntu.com/usn/USN-1100-1
- http://www.vupen.com/english/advisories/2011/0665
- https://bugzilla.novell.com/show_bug.cgi?id=674985
- https://bugzilla.redhat.com/show_bug.cgi?id=680466
Raw JSON (NVD)
Show
{
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"cveTags": [],
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"lastModified": "2026-06-16T23:28:34.620",
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