CVE-2020-20266 Null dereference in n/a
An authenticated remote attacker can cause a Denial of Service in Mikrotik RouterOS via a NULL pointer dereference in the dot1x process.
- 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-2020-20266?
CVE-2020-20266 is a medium-severity vulnerability in Mikrotik Routeros, published on 19 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mikrotik RouterOs before 6.47 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/dot1x process. An authenticated remote attacker can cause a Denial of Service (NULL pointer dereference).
Which versions are affected by CVE-2020-20266?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2020-20266?
No fix has been published for CVE-2020-20266 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-20266 being exploited?
There is no known exploitation of CVE-2020-20266 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-f9q3-7jww-gpw7.