CVE-2021-34595 CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
A crafted request can cause out-of-bounds memory access in CODESYS V2 Runtime, leading to denial-of-service or local memory overwrite.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34595?
CVE-2021-34595 is a high-severity memory corruption vulnerability in CODESYS V2, published on 26 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition or local memory overwrite.
Which versions are affected by CVE-2021-34595?
It affects 30 products.
Products include Codesys Codesys, Codesys Plcwinnt, Codesys Runtime Toolkit, Wago 750-8202 Firmware, Wago 750-8203 Firmware, Wago 750-8204 Firmware and 24 more.
How do I fix CVE-2021-34595?
No fix has been published for CVE-2021-34595 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-34595 being exploited?
There is no known exploitation of CVE-2021-34595 in the wild and no public exploit code.
Other vulnerabilities in CODESYS V2
Sources
Also known as GHSA-r36w-qc6c-g892.