Is CVE-2015-7540 in the CISA KEV catalog?

No. CVE-2015-7540 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2015-7540 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-7540?

CVE-2015-7540 has an EPSS score of 7.12% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7540?

Upgrade samba on debian 11 to 2:4.1.22+dfsg-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-7540

HIGHEPSS 93th pctl

7.5

CVSS v3

NVD

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.

CWE-399Resource Management Errors

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.1.22+dfsg-1CVE-2015-7540

sambaUbuntu

Fixed in:2:4.1.6+dfsg-1ubuntu2.14.04.11USN-2855-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

7.12%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory11

Other references2

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.