CVE-2020-20249 Memory corruption in n/a
An authenticated remote attacker can cause a Denial of Service in Mikrotik RouterOS by sending a crafted packet to the resolver 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-2020-20249?
CVE-2020-20249 is a medium-severity memory corruption vulnerability in Mikrotik Routeros, published on 19 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mikrotik RouterOs before stable 6.47 suffers from a memory corruption vulnerability in the resolver process. By sending a crafted packet, an authenticated remote attacker can cause a Denial of Service.
Weakness: CWE-787
Which versions are affected by CVE-2020-20249?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2020-20249?
No fix has been published for CVE-2020-20249 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-20249 being exploited?
There is no known exploitation of CVE-2020-20249 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-7x49-c3gr-9hhc.