Stack-based buffer overflow via unsafe sscanf in check_cookie()

published 2025-12-10 10 mo ago modified 2026-09-25 44 d ago also EUVD-2025-202414

cvss: 9.8; 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 37%
public exploits: 0; none known

An unauthenticated remote attacker can abuse unsafe sscanf calls within the check_cookie() function to write arbitrary data into fixed-size stack buffers which leads to full device compromise.

Patch / fix

fixed in 1

WAGO Indsutrial-Managed-Switches 02.64

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 10 mo ago (2025-12-18)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

WAGO Indsutrial-Managed-Switches

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

certvde.com /de/advisories/VDE-2025-095
third-party-advisory

Sources

CVE List CVE-2025-41732
NVD CVE-2025-41732

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