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CVE-2011-1024

17
FAUCET Score

CVE-2011-1024 describes a bypass vulnerability in OpenLDAP 2.4.x before 2.4.24, specifically within the back-ldap chain.c component when configured with a master-slave setup, chain overlay, and ppolicy_forward_updates. This flaw allows remote authenticated users to bypass external-program authentication by submitting an invalid password to a slave server. With a CVSS score of 4.6 (AV:N/AC:H/Au:S/C:P/I:P/A:P), this vulnerability has a network attack vector, high access complexity, and results in partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.4.6CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:2.4.6:*:*:*:*:*:*:*
2.4.7CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:2.4.7:*:*:*:*:*:*:*
2.4.8CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:2.4.8:*:*:*:*:*:*:*
2.4.9CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:2.4.9:*:*:*:*:*:*:*
2.4.10CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:2.4.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.6MEDIUM

AV:N/AC:H/Au:S/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
SINGLE
Exploitability Score
3.9
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.96%
Probability of exploitation in next 30 days
EPSS Percentile
85.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0296 is in the 92nd percentile among its peer group of 1,424 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openldap-0:2.3.43-12.el5_6.7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openldap-0:2.4.19-15.el6_0.2
View patch

Vendor Advisories (1)

redhatCVE-2011-1024Moderate

openldap: forwarded bind failure messages cause success

Jul 28, 2010

References

kb.juniper.net / InfoCenter/index
kb.juniper.net / InfoCenter/index
openwall.com / lists/oss-security/2011/02/24/12
openwall.com / lists/oss-security/2011/02/25/13
bugzilla.novell.com / show_bug.cgi
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/43331
Vendor Advisory
secunia.com / advisories/43708
secunia.com / advisories/43718
security.gentoo.org / glsa/glsa-201406-36.xml
securitytracker.com / id
mandriva.com / security/advisories
mandriva.com / security/advisories
openldap.org / devel/cvsweb.cgi/servers/slapd/back-ldap/chain.c.diff
Patch
openldap.org / its/index.cgi/Software%20Bugs
openldap.org / lists/openldap-announce/201102/msg00000.html
Patch
openldap.org / lists/openldap-technical/201004/msg00247.html
redhat.com / support/errata/RHSA-2011-0346.html
redhat.com / support/errata/RHSA-2011-0347.html
ubuntu.com / usn/USN-1100-1
vupen.com / english/advisories/2011/0665
Vendor Advisory