CVE-2023-35136 - CVE House
Back to Database
Status published Medium CVE-2023-35136

An improper input validation vulnerability in the “Quagga” package of...

Vulnerability Description

An improper input validation vulnerability in the “Quagga” package of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an authenticated local attacker to access configuration files on an affected device.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-35136

Credits & Attribution

No credits recorded in the NVD database.

References

More from Zyxel

View All →
CVE-2025-9133
A missing authorization vulnerability in Zyxel ATP series firmware versions...
High 8.1
CVE-2025-8693
A post-authentication command injection vulnerability in the "priv" parameter of...
High 8.8
CVE-2025-8078
A post-authentication command injection vulnerability in Zyxel ATP series firmware...
High 7.2
CVE-2025-7673
A buffer overflow vulnerability in the URL parser of the...
Critical 9.8
CVE-2025-6599
An uncontrolled resource consumption vulnerability in the web server of...
Medium 5.3

Affected Vendor

Affected Software

ATP series firmware, USG FLEX series firmware, USG FLEX 50(W) series firmware, USG20(W)-VPN series firmware, VPN series firmware
Vulnerable Versions:
versions 4.32 through 5.37, versions 4.50 through 5.37, versions 4.16 through 5.37, versions 4.30 through 5.37

Timeline

Official Publish: November 28th, 2023
Last Modified: June 5th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-20

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1213 Data from Information Repositories
Collection
T1565.002 Stored Data Manipulation
Impact