CVE-2020-11881 Denial of service in n/a
An unauthenticated remote attacker can crash the SMB server by sending modified setup-request packets, causing a denial of service.
- 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-2020-11881?
CVE-2020-11881 is a high-severity denial of service vulnerability in Mikrotik Routeros, published on 14 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An array index error in MikroTik RouterOS 6.41.3 through 6.46.5, and 7.x through 7.0 Beta5, allows an unauthenticated remote attacker to crash the SMB server via modified setup-request packets, aka SUP-12964.
Weakness: CWE-129
Which versions are affected by CVE-2020-11881?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2020-11881?
No fix has been published for CVE-2020-11881 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-2020-11881 being exploited?
There is no known exploitation of CVE-2020-11881 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
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-9vhh-7m5h-q2cr.