Skip to main content
View

Vulnerability Assessment

Weakness
CWE
CWE-639
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Object-level authorization, IDOR prevention
Impact

CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.5% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

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. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

This vulnerability is classified under CWE-639. 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. Affected products include: Cisco Meraki Mx65 Firmware, Cisco Meraki Mx64 Firmware, Cisco Meraki Z4C Firmware, Cisco Meraki Z4 Firmware, Cisco Meraki Z3C Firmware.

Know when Meraki Mx64W Firmware gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score
0.5%
Top 64% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.5%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:o:cisco:meraki_mx65_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx64_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_z4c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_z4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_z3c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_z3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_vmx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx600_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx450_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx105_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx95_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx84_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx75_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx68w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx68cw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx68_firmware:*:*:*:*:*:*:*:*
+ 5 more

More in Meraki Mx64W Firmware

View all
CVE-2020-24588 LOW POC
3.5 May 11

The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn
CVE-2022-20933 HIGH
8.6 Oct 26

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z3 Teleworker Gateway devices cou
CVE-2020-26141 MEDIUM
6.5 May 11

An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. Rated medium severity (CVSS 6.5), this v
CVE-2020-26140 MEDIUM
6.5 May 11

An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. Rated medium severity (CVSS 6.5), this v
CVE-2020-26139 MEDIUM
5.3 May 11

An issue was discovered in the kernel in NetBSD 7.1. Rated medium severity (CVSS 5.3), this vulnerability is no authenti
CVE-2024-20502 HIGH
7.5 Oct 02

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devic
CVE-2024-20501 HIGH
7.5 Oct 02

Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gate
CVE-2024-20500 HIGH
7.5 Oct 02

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devic
CVE-2024-20499 HIGH
7.5 Oct 02

Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gate
CVE-2024-20498 HIGH
7.5 Oct 02

Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gate
CVE-2024-20509 MEDIUM
5.9 Oct 02

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devic
CVE-2021-1224 MEDIUM
5.3 Jan 13

Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort

Same weakness CWE-639 – Authorization Bypass Through User-Controlled Key

View all
CVE-2024-50483 CRITICAL
9.8
CVE-2026-55255 HIGH POC
8.4
CVE-2025-3605 CRITICAL POC
9.8
CVE-2022-3805 HIGH POC
8.6
CVE-2025-5947 CRITICAL POC
9.8
CVE-2025-67165 CRITICAL POC
9.8
CVE-2026-18315 CRITICAL POC
9.8
CVE-2020-36923 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
ADVISORY https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy