CVE-2024-27686 Denial of service in n/a
Remote attackers can crash Mikrotik RouterOS devices by sending crafted packets to the SMB service, requiring an upgrade to version 7.
- 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-2024-27686?
CVE-2024-27686 is a high-severity denial of service vulnerability in n/a, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Mikrotik RouterOS (x86) 6.40.5 through 6.49.10 (fixed in 7) allows a remote attacker to cause a denial of service (device crash) via crafted packet data to the SMB service on TCP port 445.
Weakness: CWE-400
Which versions are affected by CVE-2024-27686?
How do I fix CVE-2024-27686?
No fix has been published for CVE-2024-27686 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-2024-27686 being exploited?
There is no known exploitation of CVE-2024-27686 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-rx53-rx95-fqqm.