Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2015-7540

22
FAUCET Score

CVE-2015-7540 is a denial-of-service vulnerability affecting the LDAP server in Samba 4.x before version 4.1.22, specifically within Active Directory domain controllers. This flaw, rated with a CVSS score of 7.5 (High), allows remote unauthenticated attackers to cause memory exhaustion and daemon crashes through crafted packets due to improper ASN.1 memory allocation checks. While the FAUCET Risk Score is high at 96/100, there is no evidence of active exploitation, public exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, < 4.1.22CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
15.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.12%
Probability of exploitation in next 30 days
EPSS Percentile
93.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0712 is in the 89th percentile among its peer group of 51,551 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, 0.1 Mastodon, and 0.4 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 (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: samba4-0:4.0.0-67.el6_7.rc4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: samba-0:4.2.3-10.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 6Fixed in: samba-0:4.1.17-16.el6rhs
View patch

Vendor Advisories (1)

redhatCVE-2015-7540Moderate

samba: DoS to AD-DC due to insufficient checking of asn1 memory allocation

Dec 16, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-December/174076.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-December/174391.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00033.html
Mailing ListThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
git.samba.org
git.samba.org
security.gentoo.org / glsa/201612-47
Third Party Advisory
samba.org / samba/security/CVE-2015-7540.html
Vendor Advisory
debian.org / security/2016/dsa-3433
Third Party Advisory
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
Third Party Advisory
securityfocus.com / bid/79736
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034492
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2855-1
Third Party Advisory
ubuntu.com / usn/USN-2855-2
Third Party Advisory