CVE-2023-38283

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-08-29 · updated 2026-06-17
Weakness: CWE-754

Description

In OpenBGPD before 8.1, incorrect handling of BGP update data (length of path attributes) set by a potentially distant remote actor may cause the system to incorrectly reset a session. This is fixed in OpenBSD 7.3 errata 006.

Affected products

Openbgpd: before 8.1 — fixed in 8.1

How to fix

Upgrade to a fixed version: Openbgpd 8.1. Check the vendor advisory for mitigations.

References

https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handling
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/006_bgpd.patch.sig
https://github.com/openbgpd-portable/openbgpd-portable/releases/tag/8.1
https://news.ycombinator.com/item?id=37305800
https://www.openbsd.org/errata73.html
https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handling
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/006_bgpd.patch.sig
https://github.com/openbgpd-portable/openbgpd-portable/releases/tag/8.1
https://news.ycombinator.com/item?id=37305800
https://www.openbsd.org/errata73.html

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