CVE-2015-7540

Name: CVE-2015-7540
Creator: NVD / NIST
Published: 2015-12-29T22:59:05.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 7.12%

Last modified Jun 17, 2026

CVE-2015-7540 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The LDAP server in the AD domain controller in Samba 4.x before 4.1.22 does not check return values to ensure successful ASN.1 memory allocation, which allows remote attackers to cause a denial of service (memory consumption and daemon crash) via crafted packets.. EPSS estimates a 7.12% chance of exploitation in the next 30 days.

Description

The LDAP server in the AD domain controller in Samba 4.x before 4.1.22 does not check return values to ensure successful ASN.1 memory allocation, which allows remote attackers to cause a denial of service (memory consumption and daemon crash) via crafted packets.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

7.12%

93.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.0.0, < 4.1.22
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	15.04
Canonical	Ubuntu Linux	15.10
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.htmlMailing List, Third Party Advisory
http://www.debian.org/security/2016/dsa-3433Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.htmlThird Party Advisory
http://www.securityfocus.com/bid/79736Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1034492Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-2855-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2855-2Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1288451Issue Tracking, Third Party Advisory
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=530d50a1abdcdf4d1775652d4c456c1274d83d8d
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=9d989c9dd7a5b92d0c5d65287935471b83b6e884
https://security.gentoo.org/glsa/201612-47Third Party Advisory
https://www.samba.org/samba/security/CVE-2015-7540.htmlVendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.htmlMailing List, Third Party Advisory
http://www.debian.org/security/2016/dsa-3433Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.htmlThird Party Advisory
http://www.securityfocus.com/bid/79736Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1034492Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-2855-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2855-2Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1288451Issue Tracking, Third Party Advisory
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=530d50a1abdcdf4d1775652d4c456c1274d83d8d
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=9d989c9dd7a5b92d0c5d65287935471b83b6e884
https://security.gentoo.org/glsa/201612-47Third Party Advisory
https://www.samba.org/samba/security/CVE-2015-7540.htmlVendor Advisory

Timeline

Published: Dec 29, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-7540?

How severe is CVE-2015-7540?

CVE-2015-7540 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 7.12% probability of exploitation in the next 30 days.

How do I fix CVE-2015-7540?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-7540?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST