CVE-2015-7687
CVE-2015-7687 is a critical-severity vulnerability in Openbsd Opensmtpd with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 4% (90th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-416
- Affected product: Openbsd Opensmtpd
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2015-7687?
- 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.
- How severe is CVE-2015-7687?
- CVE-2015-7687 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2015-7687 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2015-7687?
- CVE-2015-7687 primarily affects Openbsd Opensmtpd. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2015-7687?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2015-7687 published?
- CVE-2015-7687 was published on 2017-10-16 and last updated on 2026-06-17.
References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170448.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169600.html
- http://www.openwall.com/lists/oss-security/2015/10/03/1
- http://www.securityfocus.com/bid/76975
- https://bugzilla.redhat.com/show_bug.cgi?id=1268793
- https://www.opensmtpd.org/announces/release-5.7.2.txt
- https://www.qualys.com/2015/10/02/opensmtpd-audit-report.txt
Affected products (3)
- cpe:2.3:a:openbsd:opensmtpd:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
More vulnerabilities in Openbsd Opensmtpd
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Other CWE-416 (Use After Free) vulnerabilities
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- CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
- CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
- CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
- CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…