CVE-2021-34585 CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)
Crafted requests to the CODESYS V2 web server cause a null pointer dereference, resulting in a denial of service.
- 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-2021-34585?
CVE-2021-34585 is a high-severity 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
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests can trigger a parser error. Since the parser result is not checked under all conditions, a pointer dereference with an invalid address can occur. This leads to a denial of service situation.
Weakness: CWE-252
Which versions are affected by CVE-2021-34585?
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-2021-34585?
No fix has been published for CVE-2021-34585 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-34585 being exploited?
There is no known exploitation of CVE-2021-34585 in the wild and no public exploit code.
Other vulnerabilities in CODESYS V2
Sources
Also known as GHSA-rhmm-fwg9-r5m5.