CVE-2024-27686Public exploitNetwork attack vector

SMB service crash via out-of-bounds pointer dereference

Published May 8, 2026 · Updated May 8, 2026

Denial of service in MikroTik RouterOS x86 6.40.5 through 6.44 and 6.48.1 through 6.49.10 allows remote attackers to crash SMB. Packet bytes after the SMB2 header influence ESI, and the SMB process dereferences that register outside mapped memory, raising SIGSEGV. TCP port 445 must expose SMB; the service can restart after about 60 seconds, but repeated packets can leave it unavailable until manual restart.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in MikroTik RouterOS x86 6.40.5 through 6.44 and 6.48.1 through 6.49.10 allows remote attackers to crash SMB. Packet bytes after the SMB2 header influence ESI, and the SMB process dereferences that register outside mapped memory, raising SIGSEGV. TCP port 445 must expose SMB; the service can restart after about 60 seconds, but repeated packets can leave it unavailable until manual restart.

The record

CVE
CVE-2024-27686
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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