CVE-2021-25664 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 packets that trigger an infinite loop in the Hop-by-Hop header processing.
- 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-2021-25664?
CVE-2021-25664 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 the Hop-by-Hop extension header in IPv6 packets and its options lacks any checks against the length field of the header, allowing attackers to put the function into an infinite loop by supplying arbitrary length values.
Weakness: CWE-835
Which versions are affected by CVE-2021-25664?
It affects 5 products.
Products include Siemens Capital Vstar, Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Readystart V4, Siemens Nucleus Source Code.
How do I fix CVE-2021-25664?
No fix has been published for CVE-2021-25664 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-2021-25664 being exploited?
There is no known exploitation of CVE-2021-25664 in the wild and no public exploit code.
Other vulnerabilities in Siemens Capital Embedded AR Classic 431-422
Sources
Also known as GHSA-q7wx-433j-27hv.