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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.011 (64.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000
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
- cert.vde.com/en/advisories/VDE-2020-036/ (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.