CVE-2024-54952
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMikroTik RouterOS 6.40.5, the SMB service contains a memory corruption vulnerability. Remote, unauthenticated attackers can exploit this issue by sending specially crafted packets, triggering a null pointer dereference. This leads to a Remote Denial of Service (DoS), rendering the SMB service unavailable.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceMikroTik RouterOS 6.40.5 SMB service contains a memory corruption vulnerability where remote, unauthenticated attackers can send specially crafted packets to trigger a null pointer dereference, causing the SMB service to crash and become unavailable.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 6.40.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify RouterOS versionAccess the router via Winbox, SSH, or web admin, then run the command '/system resource print' or check 'System > Resources' in the web interface to view the installed RouterOS version.Affected if The displayed version number is exactly 6.40.5
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Confirm SMB service is enabledRun '/ip service print' via CLI or check 'IP > Services' in the web admin to list all active services. Look for the 'smb' service and verify its 'disabled' field shows 'no'.Affected if The SMB service is enabled (not disabled)
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Verify SMB port accessibilityRun '/ip service print' to see which IP addresses the SMB service is bound to. Alternatively, run a port scan against the router's public or accessible IP addresses on TCP port 445 (or port 139) to confirm the SMB service is reachable from untrusted networks.Affected if The SMB service is bound to 0.0.0.0 or is otherwise reachable from attacker-controlled networks
You are affected only if your MikroTik RouterOS is exactly version 6.40.5 AND the SMB service is enabled AND the SMB port is accessible from the network where attackers can send packets.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade MikroTik RouterOS to a version newer than 6.40.5 that includes the fix for this vulnerability. If immediate upgrade is not possible, consider disabling the SMB service if not required, or restricting network access to the SMB port.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-54952 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-54952 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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