CVE-2021-34583 CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)
Crafted requests to the CODESYS V2 web server can trigger a heap-based buffer overflow, causing a denial-of-service crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34583?
CVE-2021-34583 is a high-severity memory corruption vulnerability in CODESYS V2, published on 26 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Crafted web server requests may cause a heap-based buffer overflow and could therefore trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.
Which versions are affected by CVE-2021-34583?
It affects 28 products.
Products include Codesys Codesys, Wago 750-8202 Firmware, Wago 750-8203 Firmware, Wago 750-8204 Firmware, Wago 750-8206 Firmware, Wago 750-8207 Firmware and 22 more.
How do I fix CVE-2021-34583?
No fix has been published for CVE-2021-34583 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-2021-34583 being exploited?
There is no known exploitation of CVE-2021-34583 in the wild and no public exploit code.
Other vulnerabilities in CODESYS V2
Sources
Also known as GHSA-rx79-rgx5-5gqx.