Due to a firewall misconfiguration, Kerlink devices running KerOS prior to 5.12 incorrectly accept specially crafted UDP packets.

published 2025-12-01 11 mo ago modified 2026-11-08 20 h ago also EUVD-2024-30206

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

Due to a firewall misconfiguration, Kerlink devices running KerOS prior to 5.12 incorrectly accept specially crafted UDP packets. This allows an attacker to bypass the firewall and access UDP-based services that would otherwise be protected.

Patch / fix

fixed in 1

kerlink keros 5.12

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 11 mo ago (2025-12-01)

Exploit prediction

0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AC:L/AV:N/A:N/C:L/I:N/PR:N/S:U/UI:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Classification

Weakness

CWE-402 Transmission of Private Resources into a New Sphere
CWE-940 Improper Verification of Source of a Communication Channel

References

keros.docs.kerlink.com /security/security_advisories_kerOS5
vendor-advisory
bdosecurity.de /en-gb/advisories/cve-2024-32388
third-party-advisory

Sources

CVE List CVE-2024-32388
NVD CVE-2024-32388

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