CVE-2023-29323: OpenSMTPD · CVE-2023-29323 is a
Affects OpenSMTPDSource CVE Database V5
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Apr 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubopensmtpd/OpenSMTPDpkg:github/opensmtpd/OpenSMTPDOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should upgrade to OpenBSD 7.1 with errata 024 or later, OpenBSD 7.2 with errata 020 or later, or OpenSMTPD Portable at or beyond commit f748277 (7.0.0-portable). No other mitigation or workaround is indicated in the available data.
Description
CVE-2023-29323 is a vulnerability in OpenSMTPD's ascii_load_sockaddr function that can cause the service to abort when handling connections from local, scoped IPv6 addresses. This affects OpenBSD versions before 7.1 errata 024 and 7.2 before errata 020, as well as OpenSMTPD Portable versions before 7.0.0-portable commit f748277.
References
- ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/020_smtpd.patch.sig (opens in a new tab)
- ftp.openbsd.org/pub/OpenBSD/patches/7.1/common/024_smtpd.patch.sig (opens in a new tab)
- cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/smtpd/envelope.c.diff?r1=1.49&r2=1.49.4.1&f=h (opens in a new tab)
- cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/smtpd/envelope.c.diff?r1=1.50&r2=1.50.4.1&f=h (opens in a new tab)
- cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/smtpd/envelope.c.diff?r1=1.50&r2=1.51&f=h (opens in a new tab)
- github.com/OpenSMTPD/OpenSMTPD/commit/41d0eae481f538956b1f1fbadfb535043454061f (opens in a new tab)
- github.com/openbsd/src/commit/f748277ed1fc7065ae8998d61ed78b9ab1e55fae (opens in a new tab)
- security.netapp.com/advisory/ntap-20230526-0006/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GZBNQBHCM6PIOUR6I5GEQS35XYT2NX6T/ (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GZBNQBHCM6PIOUR6I5GEQS35XYT2NX6T/ (opens in a new tab)