CVE-2021-38311 Denial of service in n/a
Attackers can cause denial of service and excessive CPU consumption in Contiki OS Telnet service via infinite acknowledgment loops.
- 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-2021-38311?
CVE-2021-38311 is a high-severity denial of service vulnerability in n/a, published on 9 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption.
Weakness: CWE-835
Which versions are affected by CVE-2021-38311?
It affects 1 product.
Products include Contiki-Os Contiki.
How do I fix CVE-2021-38311?
No fix has been published for CVE-2021-38311 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-2021-38311 being exploited?
There is no known exploitation of CVE-2021-38311 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-cw9g-qwf2-42hw.