dbcve.org
Meraki Mx65 FirmwareOperating system · Cisco

CVE-2024-20513

MEDIUM · 5.3 CVSS v3.1 Published 2024-10-02
Fix available
A fix is available. Upgrade to 18.211.2 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition for targeted users of the AnyConnect service on an affected device. This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.

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 confidence

This vulnerability exists in the Cisco AnyConnect VPN server component of Meraki MX and Z Series Teleworker Gateway devices. The root cause is insufficient entropy in session handlers generated during SSL VPN session establishment. Attackers can either brute-force valid session handlers (unauthenticated) or predict handlers after obtaining one valid handler (authenticated). Sending crafted HTTPS requests with these handlers allows termination of target VPN sessions, forcing users to reconnect and reauthenticate.

MitigationApply vendor-supplied firmware updates from Cisco Meraki when available. For immediate risk reduction, consider rate-limiting AnyConnect VPN endpoints and monitoring for anomalous session termination patterns.

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
Meraki Mx65 FirmwareOperating system
Affected:>= 17.6.0, < 18.211.2
Meraki Mx64 FirmwareOperating system
Affected:>= 17.6.0, < 18.211.2
Meraki Z4c FirmwareOperating system
Affected:>= 16.2, < 18.211.2
Meraki Z4 FirmwareOperating system
Affected:>= 16.2, < 18.211.2
Meraki Z3c FirmwareOperating system
Affected:>= 16.2, < 18.211.2
Meraki Z3 FirmwareOperating system
Affected:>= 16.2, < 18.211.2
Meraki Vmx FirmwareOperating system
Affected:>= 16.2, < 18.211.2
Meraki Mx600 FirmwareOperating system
Affected:>= 16.2, < 18.211.2

CVSS 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
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify device model
    Locate the Meraki device model number (MX65, MX64, Z4c, Z4, Z3c, Z3, VMX, or MX600) from the Meraki dashboard, device label, or CLI output (show version)
    Affected if Device model is NOT one of these: MX65, MX64, Z4c, Z4, Z3c, Z3, VMX, MX600 - then not affected
  2. Check installed firmware version
    Access Meraki dashboard > Organization > Monitor > Firmware or use CLI command 'show version' to retrieve the current firmware version running on the device
    Affected if Firmware version is greater than or equal to 17.6.0 (for MX64/MX65) or 16.2 (for all other models) AND less than 18.211.2 - device is within affected version range
  3. Verify AnyConnect VPN is enabled
    Navigate to Meraki dashboard > Security & SD-WAN > VPN > Client VPN or use CLI to check if AnyConnect VPN feature is configured and active on the device
    Affected if AnyConnect VPN is enabled - the vulnerability only affects devices with this feature configured; devices without VPN enabled are not exploitable

Device is affected if it is an MX64, MX65, Z4c, Z4, Z3c, Z3, VMX, or MX600 running firmware version 16.2 to 18.211.2 (or 17.6.0 to 18.211.2 for MX64/65) with AnyConnect VPN enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Upgrade available Upgrade to 18.211.2 or later
Fixed in 18.211.2
Interim mitigation

Apply vendor-supplied firmware updates from Cisco Meraki when available. For immediate risk reduction, consider rate-limiting AnyConnect VPN endpoints and monitoring for anomalous session termination patterns.

Recommended fix High confidence

Upgrade to Meraki MX/Z Series firmware version 18.211.2 or later (e.g., latest stable release)

  1. 1. Identify the specific Meraki MX or Z Series device model in your environment from the affected list (MX64, MX65, MX600, Z3, Z3c, Z4, Z4c, VMx)
  2. 2. Check the current firmware version of affected devices via the Meraki dashboard (Network-wide > Monitor > Devices > select device > Status > Firmware)
  3. 3. Navigate to Network-wide > Configure > General in the Meraki dashboard
  4. 4. In the Firmware upgrades section, configure automatic upgrades or schedule an upgrade to version 18.211.2 or later
  5. 5. For manual upgrade: Select the device, click 'Update firmware' and choose version 18.211.2 or later
  6. 6. After upgrade, verify the new firmware version matches 18.211.2 or higher
  7. 7. Test AnyConnect VPN functionality to ensure normal operation after upgrade
Caveat Standard firmware upgrade - ensure adequate maintenance window as VPN sessions will be interrupted during the upgrade process

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Meraki Mx65 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-20513 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data