CVE-2021-25663 Denial of service in Capital Embedded AR Classic 431-422
Attackers can cause a denial of service in Siemens Nucleus RTOS products by sending crafted IPv6 headers that trigger an infinite loop.
- 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-2021-25663?
CVE-2021-25663 is a high-severity denial of service vulnerability in Siemens Capital Embedded AR Classic 431-422, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
Weakness: CWE-835
Which versions are affected by CVE-2021-25663?
It affects 4 products.
Products include Siemens Capital Vstar, Siemens Nucleus Net, Siemens Nucleus Readystart, Siemens Nucleus Source Code.
How do I fix CVE-2021-25663?
No fix has been published for CVE-2021-25663 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-25663 being exploited?
There is no known exploitation of CVE-2021-25663 in the wild and no public exploit code.
Other vulnerabilities in Siemens Capital Embedded AR Classic 431-422
Sources
Also known as GHSA-m3qf-xv59-6w6h.