Buffer overflow in Wago 750-8100
CVE-2021-34566
In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.
Vulnerability class: Buffer Overflow
EPSS: 0.010 (59.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Wago 750-8100
- Wago 750-8100_firmware — versions 18
- Wago 750-8101
- Wago 750-8101\/025-000
- Wago 750-8101\/025-000_firmware — versions 18
- Wago 750-8101_firmware — versions 18
- Wago 750-8102
- Wago 750-8102\/025-000
- Wago 750-8102\/025-000_firmware — versions 18
- Wago 750-8102_firmware — versions 18
Weakness classification (CWE)
Public proof-of-concept exploits
References
- info@cert.vde.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-34566?
- CVE-2021-34566 is a critical-severity vulnerability in Wago 750-8100, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.1/10. Published 2022-11-09.
- How severe is CVE-2021-34566?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2021-34566 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.