CVE-2020-20253 Denial of service in n/a
An authenticated remote attacker can cause a Denial of Service in Mikrotik RouterOS via a divide by zero error in the lcdstat 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-2020-20253?
CVE-2020-20253 is a medium-severity denial of service vulnerability in Mikrotik Routeros, published on 18 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 divison by zero vulnerability in the /nova/bin/lcdstat process. An authenticated remote attacker can cause a Denial of Service due to a divide by zero error.
Weakness: CWE-369
Which versions are affected by CVE-2020-20253?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2020-20253?
No fix has been published for CVE-2020-20253 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-2020-20253 being exploited?
There is no known exploitation of CVE-2020-20253 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-qm8m-4g9c-j864.