Out-of-bounds write in Cisco Meraki MX Firmware
Priority MEDIUM 44CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00505 43rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Meraki MX Firmware | N/A | — | No fix listed | CNA |
- Cisco Meraki MX Firmware VendorCisco Affected N/A Fixed in — No fix listed CNA
CPE configurations NVD · 50
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:meraki_mx65_firmware:*:*:*:*:*:*:*:* | 17.6.0 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx65:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx64_firmware:*:*:*:*:*:*:*:* | 17.6.0 – 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx64:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_z4c_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_z4c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_z4_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_z4:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_z3c_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_z3c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:meraki_mx65_firmware:*:*:*:*:*:*:*:* Versions 17.6.0 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx65:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx64_firmware:*:*:*:*:*:*:*:* Versions 17.6.0 – 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx64:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_z4c_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_z4c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_z4_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_z4:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_z3c_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_z3c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 40 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:meraki_z3_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_z3:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_vmx_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_vmx:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx600_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx450_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx450:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx400_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx250_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx105_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx105:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx100_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx95_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx95:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx85_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx85:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx84_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx84:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx75_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx75:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx68w_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx68w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx68cw_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx68cw:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx68_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx68:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx67w_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx67w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx67c_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx67c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx67_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx67:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx65w_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx65w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:meraki_mx64w_firmware:*:*:*:*:*:*:*:* | 16.2 to before 18.211.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:meraki_mx64w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:meraki_z3_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_z3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_vmx_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_vmx:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx600_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx450_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx450:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx400_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx250_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx105_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx105:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx100_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx95_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx95:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx85_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx85:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx84_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx84:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx75_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx75:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx68w_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx68w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx68cw_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx68cw:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx68_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx68:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx67w_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx67w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx67c_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx67c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx67_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx67:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx65w_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx65w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:meraki_mx64w_firmware:*:*:*:*:*:*:*:* Versions 16.2 to before 18.211.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:meraki_mx64w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-20501
- 2026-10-03 Alias added: GHSA-56gq-526p-7vqp
References
Advisory 1
More Cisco Meraki Mx100 Firmware vulnerabilities
- TI-2022-05492 Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2024-13423 Out-of-bounds write in Cisco Meraki MX Firmware CVSS 3.1HIGH 8.6
- TI-2024-13422 Double free in Cisco Meraki MX Firmware CVSS 3.1HIGH 8.6
- TI-2024-13424 Uncontrolled resource consumption in Cisco Meraki MX Firmware CVSS 3.1HIGH 7.5
- TI-2024-13426 Uncontrolled resource consumption in Cisco Meraki MX Firmware CVSS 3.1HIGH 7.5
- TI-2021-00951 Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability CVSS 3.1MEDIUM 5.8
Sources
- CVE-2024-20501 · CVE Program
- CVE-2024-20501 · NVD
- FIRST EPSS
- GHSA-56gq-526p-7vqp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences