CVE-2015-7687

Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial...

9.8 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.08%Down 0.4 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2015-7687
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-416
Updated: 2026-11-02

CVE List No score

Record: CVE-2015-7687
Updated: 2026-11-02

EUVDEUVD-2015-7589 No score

Record: EUVD-2015-7589
Updated: 2026-11-03

GitHub AdvisoriesGHSA-hmqq-mf9r-frq9 9.8

Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial...

Record: GHSA-hmqq-mf9r-frq9
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-416
Updated: 2026-11-02

OSV 9.8

Record: CVE-2015-7687
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2015-7687 9.8

Record: DEBIAN-CVE-2015-7687
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2015-7687 9.8

Record: UBUNTU-CVE-2015-7687
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`opensmtpd` Debian:12	before 5.7.3p1-1	5.7.3p1-1
`opensmtpd` Debian:13	before 5.7.3p1-1	5.7.3p1-1
`opensmtpd` Debian:14	before 5.7.3p1-1	5.7.3p1-1
`opensmtpd` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 5.3.3p1-45.4.1p1-15.4.1p1-1ubuntu0.1~esm1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-7687 is a critical vulnerability (CVSS 9.8) in Openbsd Opensmtpd, published October 16, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.08%, the 90th percentile. Fixed in opensmtpd 5.7.3p1-1.

References

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