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Vulnerability Assessment

Weakness
CWE
CWE-400
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

A remote attacker could cause denial of service by exhausting system resources by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.6% exploitation probability (EPSS)

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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 in. Rated high severity (CVSS 7.5), 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. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.

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Technical ContextAI · show details

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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 in the AnyConnect service on an affected device. This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention. Affected products include: Cisco Meraki Z4C Firmware, Cisco Meraki Z4 Firmware, Cisco Meraki Z3C Firmware, Cisco Meraki Z3 Firmware, Cisco Meraki Vmx Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
High

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 in the AnyConnect service on an affected device.

This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.

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

Threat Intelligence Overview

EPSS Score
0.6%
Top 58% 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 HIGH
CISA KEV No
Public POC No
EPSS 0.6%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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

39
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

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:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx67w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:meraki_mx67c_firmware:*:*:*:*:*:*:*:*
+ 5 more

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Same weakness CWE-400 – Uncontrolled Resource Consumption

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CVE-2022-29885 HIGH POC
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CVE-2016-8610 HIGH
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CVE-2026-28318 HIGH POC
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CVE-2023-38180 HIGH
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CVE-2025-26673 HIGH
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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References

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

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