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CVE-2024-20509

MEDIUM
5.9
CVSS Score
Published: October 2, 2024 at 06:24 PM UTC
Updated: June 17, 2026 at 07:07 AM UTC
51 products affected across 1 vendorMeraki MX68W FirmwareMeraki MX68CW FirmwareMeraki MX64W Firmware

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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 hijack an AnyConnect VPN session or cause a denial of service (DoS) condition for individual users of the AnyConnect VPN service on an affected device. This vulnerability is due to weak entropy for handlers that are used during the VPN authentication process as well as a race condition that exists in the same process. An attacker could exploit this vulnerability by correctly guessing an authentication handler and then sending crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to take over the AnyConnect VPN session from a target user or prevent the target user from establishing an AnyConnect VPN session with the affected device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Meraki MX100 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx100 (same device)
Meraki MX105 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx105 (same device)
Meraki MX250 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx250 (same device)
Meraki MX400 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx400 (same device)
Meraki MX450 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx450 (same device)
Meraki MX600 Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx600 (same device)
Meraki MX64 Firmware· Cisco
95%
17.6.0 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx64 (same device)
Meraki MX64W Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx64w (same device)
Meraki MX65 Firmware· Cisco
95%
17.6.0 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx65 (same device)
Meraki MX65W Firmware· Cisco
95%
16.2 ≤ v < 18.211.2
Affected range stops below 18.211.2, so it looks safe — our inference, not a vendor statement
cisco-meraki-mx65w (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-by-QWUkqV7X

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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