Is CVE-2015-7687 in the CISA KEV catalog?

No. CVE-2015-7687 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7687?

CVE-2015-7687 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2015-7687?

CVE-2015-7687 has an EPSS score of 4.09% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7687?

Upgrade opensmtpd on debian 11 to 5.7.3p1-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-7687

CRITICALEPSS 90th pctl

9.8

CVSS v3

NVD

Description

Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via vectors involving req_ca_vrfy_smtp and req_ca_vrfy_mta.

CWE-416Use After Free

How to fix

Remediation Available

opensmtpdDebian

Fixed in:5.7.3p1-1CVE-2015-7687

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.09%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Exploit1

qualys.com

Vendor Advisory1

opensmtpd.org

Third-Party Advisory5

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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 2026-05-13.