Westermo WeOS 5 through 5.23.0 allows a reboot via a malformed ESP packet.

published 2025-04-24 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-12150

cvss: 5.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits: 0; none known

Patch / fix

fixed in 1

Westermo WeOS 5.24.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-261-02 updated 2025-09-18 cvss 5.9

Westermo Network Technologies WeOS 5

Westermo Network Technologies WeOS 5 <=5.23.0
affected: vendor fix, mitigation “For more information refer to Westermo's security advisory Westermo-25-02.” westermo.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-24)

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Westermo WeOS

Classification

Weakness

CWE-1286 Improper Validation of Syntactic Correctness of Input

References

westermo.com /-/media/Files/Cyber-security/westermo_sa_25-02_malformed_esp_packet_could_cause_denial_vulnerability_in_weos.

Sources

CVE List CVE-2025-46419
NVD CVE-2025-46419

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