CVE-2020-20211 Denial of service in n/a
An authenticated remote attacker can cause a Denial of Service in Mikrotik RouterOS via a crafted packet triggering an assertion failure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-20211?
CVE-2020-20211 is a medium-severity denial of service vulnerability in Mikrotik Routeros, published on 7 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mikrotik RouterOs 6.44.5 (long-term tree) suffers from an assertion failure vulnerability in the /nova/bin/console process. An authenticated remote attacker can cause a Denial of Service due to an assertion failure via a crafted packet.
Weakness: CWE-617
Which versions are affected by CVE-2020-20211?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2020-20211?
No fix has been published for CVE-2020-20211 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-2020-20211 being exploited?
There is no known exploitation of CVE-2020-20211 in the wild and no public exploit code.
Other vulnerabilities in Mikrotik Routeros
- CVE-2018-7445 MikroTik RouterOS Stack-Based Buffer Overflow
- CVE-2026-86060 MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command
- CVE-2018-14847 MikroTik Router OS Directory Traversal
- CVE-2026-67277 MikroTik RouterOS Missing Authentication for Critical Function
- CVE-2026-67279 Mikrotik RouterOS Improper Enforcement of Behavioral Workflow
Sources
Also known as GHSA-jxc4-r8mv-r847.