Vulnerability · Published Oct 26, 2021 · Assigned by CERTVDE
CVE-2021-34593CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service
High 7.5
In plain English
A high-severity security flaw in CODESYS V2 from CODESYS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.7% (higher than 86% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)2.7%top 14.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| CODESYS | CODESYS V2 | Runtime Toolkit 32 bit full – before V2.4.7.56PLCWinNT – before V2.4.7.56 |
Weakness: CWE-755 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download= x_refsource_CONFIRM
- 20211029 SEC Consult SA-20211028-0 :: Denial of Service in CODESYS V2 mailing-list, x_refsource_FULLDISC
- http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html x_refsource_MISC
- http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html x_refsource_MISC