OpenBSD 7.3 invalid l2tp message npppd crash

published 2024-03-01 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57181

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits: 0; none known

In OpenBSD 7.3 before errata 016, npppd(8) could crash by a l2tp message which has an AVP (Attribute-Value Pair) with wrong length.

Patch / fix

fixed in 1 links 2

OpenBSD OpenBSD 7.3 errata 016, 7.3_errata_016

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-03-01)

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

OpenBSD OpenBSD

Classification

Weakness

CWE-131 Incorrect Calculation of Buffer Size
CWE-805 Buffer Access with Incorrect Length Value

References

Sources

CVE List CVE-2023-52557
NVD CVE-2023-52557

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary