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CVE-2015-3223

17
FAUCET Score

CVE-2015-3223 describes a denial-of-service vulnerability in the ldb_wildcard_compare function within the LDB library, affecting Samba 4.x versions prior to 4.1.22, 4.2.7, and 4.3.3 when used as an AD LDAP server. This flaw allows remote attackers to trigger an infinite loop by sending specially crafted packets containing certain zero values. Rated Medium (CVSS 5.3), it requires no authentication or user interaction, posing a low impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.0.0CPE matchmatch criteria
cpe:2.3:a:samba:samba:4.0.0:*:*:*:*:*:*:*
4.0.1CPE matchmatch criteria
cpe:2.3:a:samba:samba:4.0.1:*:*:*:*:*:*:*
4.0.2CPE matchmatch criteria
cpe:2.3:a:samba:samba:4.0.2:*:*:*:*:*:*:*
4.0.3CPE matchmatch criteria
cpe:2.3:a:samba:samba:4.0.3:*:*:*:*:*:*:*
4.0.4CPE matchmatch criteria
cpe:2.3:a:samba:samba:4.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.88%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0688 is in the 91st percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libldb-0:1.1.13-3.el6_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libldb-0:1.1.20-1.el7_2.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 6Fixed in: libldb-0:1.1.20-3.el6rhs
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 7Fixed in: libldb-0:1.1.20-3.el7rhgs
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libldb

Vendor Advisories (1)

redhatCVE-2015-3223Moderate

libldb: Remote DoS in Samba (AD) LDAP server

Dec 16, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-December/174076.html
lists.fedoraproject.org / pipermail/package-announce/2015-December/174391.html
lists.opensuse.org / opensuse-security-announce/2015-12/msg00019.html
lists.opensuse.org / opensuse-security-announce/2015-12/msg00020.html
lists.opensuse.org / opensuse-security-announce/2015-12/msg00032.html
lists.opensuse.org / opensuse-security-announce/2015-12/msg00033.html
lists.opensuse.org / opensuse-security-announce/2016-04/msg00042.html
bugzilla.redhat.com / show_bug.cgi
git.samba.org
git.samba.org
security.gentoo.org / glsa/201612-47
samba.org / samba/security/CVE-2015-3223.html
Vendor Advisory
debian.org / security/2016/dsa-3433
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
securityfocus.com / bid/79731
securitytracker.com / id/1034493
ubuntu.com / usn/USN-2855-1
ubuntu.com / usn/USN-2855-2
ubuntu.com / usn/USN-2856-1