CVE-2021-34566 WAGO I/O-Check Service prone to Memory Overflow
Unauthenticated remote attackers can send crafted packets to crash the service and potentially execute code via memory overflow in WAGO I/O-Check 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-2021-34566?
CVE-2021-34566 is a critical memory corruption vulnerability in WAGO 750-81xx/xxx-xxxFW, published on 9 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.
Weakness: CWE-120
Which versions are affected by CVE-2021-34566?
It affects 49 products.
Products include Wago 750-8100 Firmware, Wago 750-8101\/025-000 Firmware, Wago 750-8101 Firmware, Wago 750-8102\/025-000 Firmware, Wago 750-8102 Firmware, Wago 750-8202\/000-011 Firmware and 43 more.
How do I fix CVE-2021-34566?
No fix has been published for CVE-2021-34566 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-2021-34566 being exploited?
There is no known exploitation of CVE-2021-34566 in the wild and no public exploit code.
Other vulnerabilities in WAGO 750-81xx/xxx-xxxFW
- CVE-2021-34569 WAGO I/O-Check Service prone to Out-of-bounds Write
- CVE-2021-34567 WAGO I/O-Check Service prone to Out-of-bounds Read
- CVE-2021-34568 WAGO I/O-Check Service prone to Allocation of Resources Without Limits or Throttling
- CVE-2022-3281 WAGO: multiple products - Loss of MAC-Address-Filtering after reboot
- CVE-2022-22511 WAGO PLCs WBM vulnerable to reflected XSS
Sources
Also known as GHSA-xcqq-8632-69xx.