What is the CVSS score of CVE-2015-7540?

CVE-2015-7540 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 43.3%.

Samba CVE-2015-7540

HIGH

Resource Management Errors (CWE-399)

2015-12-29 secalert@redhat.com

Denial Of Service Debian Canonical Debian Linux Samba Ubuntu Linux

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-399
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 43.30%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.

No patch listed yet 43.3% exploitation probability (EPSS)

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AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 43.3% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-399. 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. Affected products include: Samba, Canonical Ubuntu Linux, Debian Debian Linux. Version information: before 4.1.22.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

43.3%

Top 2% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 43.3%

Patch available No

Active threat No

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +43

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

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References

Advisories & patches

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

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