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Fencer Vulns
high 8.6

CVE-2024-20498 json

Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could a…

published 2024-10-02 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-18213

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Multiple vulnerabilities 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 in the AnyConnect service on an affected device.

These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.

Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.

Patch / fix

  • cisco meraki_mx65_firmware 18.211.2
  • cisco meraki_mx64_firmware 18.211.2
  • cisco meraki_z4c_firmware 18.211.2
  • cisco meraki_z4_firmware 18.211.2
  • cisco meraki_z3c_firmware 18.211.2
  • cisco meraki_z3_firmware 18.211.2
  • cisco meraki_vmx_firmware 18.211.2
  • cisco meraki_mx600_firmware 18.211.2
  • cisco meraki_mx450_firmware 18.211.2
  • cisco meraki_mx400_firmware 18.211.2
  • cisco meraki_mx250_firmware 18.211.2
  • cisco meraki_mx105_firmware 18.211.2
  • cisco meraki_mx100_firmware 18.211.2
  • cisco meraki_mx95_firmware 18.211.2
  • cisco meraki_mx85_firmware 18.211.2
  • cisco meraki_mx84_firmware 18.211.2
  • cisco meraki_mx75_firmware 18.211.2
  • cisco meraki_mx68w_firmware 18.211.2
  • cisco meraki_mx68cw_firmware 18.211.2
  • cisco meraki_mx68_firmware 18.211.2

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Cisco Cisco Meraki MX Firmware
  • cisco meraki_mx
  • cisco meraki_z1

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.