CVE-2023-29323

ascii_load_sockaddr in smtpd in OpenBSD before 7.1 errata 024 and 7.2 before errata 020, and...

7.8 HighFix available

ascii_load_sockaddr in smtpd in OpenBSD before 7.1 errata 024 and 7.2 before errata 020, and OpenSMTPD Portable before 7.0.0-portable commit f748277, can abort upon a connection from a local, scoped IPv6 address.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.28%Up 0.2 points since Apr 5, 2023

What each source reports

NVD Score used 7.8

Record: CVE-2023-29323
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

CVE List No score

Record: CVE-2023-29323
Updated: 2026-11-02

EUVDEUVD-2023-32898 No score

Record: EUVD-2023-32898
Updated: 2026-11-02

GitHub AdvisoriesGHSA-c3j9-w5jx-cmmq 7.8

ascii_load_sockaddr in smtpd in OpenBSD before 7.1 errata 024 and 7.2 before errata 020, and...

ascii_load_sockaddr in smtpd in OpenBSD before 7.1 errata 024 and 7.2 before errata 020, and OpenSMTPD Portable through 7.0.0-portable, can abort upon a connection from a local, scoped IPv6 address.

Record: GHSA-c3j9-w5jx-cmmq
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2023-29323 7.8

Record: DEBIAN-CVE-2023-29323
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-29323 7.8

Record: UBUNTU-CVE-2023-29323
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSV No score

Record: CVE-2023-29323
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`opensmtpd` Debian:12	All versions, plus listed versions 6.8.0p2-47.3.0p1-17.3.0p2-17.4.0p1-17.4.0p1-1~bpo12+1 Show 6 moreShow less 7.5.0p0-17.6.0p1-17.7.0p0-17.8.0p0-17.8.0p0-27.9.0p0-1	None known
`opensmtpd` Debian:13	before 7.3.0p1-1	7.3.0p1-1
`opensmtpd` Debian:14	before 7.3.0p1-1	7.3.0p1-1
`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
`opensmtpd` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 5.4.2p1-45.7.3p1-15.7.3p2-15.7.3p2-1ubuntu0.1~esm15.7.3p2-1ubuntu0.1~esm2	None known
`opensmtpd` Ubuntu:18.04:LTS	All versions, plus listed versions 6.0.2p1-2build16.0.3p1-16.0.3p1-1build16.0.3p1-1ubuntu0.16.0.3p1-1ubuntu0.2	None known
`opensmtpd` Ubuntu:20.04:LTS	All versions, plus listed versions 6.0.3p1-66.0.3p1-6build16.6.1p1-16.6.1p1-36.6.1p1-46.6.1p1-56.6.2p1-16.6.4p1-1	None known
`opensmtpd` Ubuntu:22.04:LTS	All versions, plus listed versions 6.8.0p2-36.8.0p2-46.8.0p2-4build1	None known
`opensmtpd` Ubuntu:24.04:LTS	All versions, plus listed versions 7.3.0p1-17.3.0p2-17.4.0p1-17.4.0p1-1build27.4.0p1-1build4	None known
`opensmtpd` Ubuntu:25.10	All versions, plus listed versions 7.5.0p0-17.7.0p0-1	None known
`opensmtpd` Ubuntu:26.10	All versions, plus listed versions 7.8.0p0-27.8.0p0-2build1	None known
`opensmtpd` Ubuntu:26.04:LTS	All versions, plus listed versions 7.7.0p0-17.8.0p0-17.8.0p0-2	None known

History

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

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

In short

CVE-2023-29323 is a high vulnerability (CVSS 7.8) in Openbsd, published April 4, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in opensmtpd 7.3.0p1-1.

References

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