How severe is CVE-2024-27686?

CVE-2024-27686 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-27686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-27686?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-27686 have an EU (EUVD) identifier?

Yes. CVE-2024-27686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-24880.

When was CVE-2024-27686 published?

CVE-2024-27686 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2024-27686

CVE-2024-27686 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-24880
Weakness: CWE-400
Published: 2026-05-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-27686?: 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.
How severe is CVE-2024-27686?: CVE-2024-27686 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-27686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-27686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-27686 have an EU (EUVD) identifier?: Yes. CVE-2024-27686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-24880.
When was CVE-2024-27686 published?: CVE-2024-27686 was published on 2026-05-08 and last updated on 2026-06-17.

References

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