Vulnerability in Codesys V2
CVE-2021-34593
In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
- Codesys V2 — versions Runtime Toolkit 32 bit full, PLCWinNT
- Codesys Plcwinnt
- Codesys Runtime Toolkit
- Wago 750-8202
- Wago 750-8202 Firmware
- Wago 750-8203
- Wago 750-8203 Firmware
- Wago 750-8204
- Wago 750-8204 Firmware
- Wago 750-8206
Weakness classification (CWE)
Public proof-of-concept exploits
References
- customers.codesys.com/index.php (Vendor Advisory)
- seclists.org/fulldisclosure/2021/Oct/64 (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html (Exploit, VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-E… (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34593?
- CVE-2021-34593 is a high-severity vulnerability in Codesys V2, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2021-10-26.
- How severe is CVE-2021-34593?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-34593 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.