Path traversal in ZyWALL VPN2S - CVE-2021-35027
Published: October 4, 2021
Vulnerability identifier: #VU57008
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-35027
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in the web server. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
Affected software
ZyWALL VPN2S
How to mitigate CVE-2021-35027
Install update from vendor's website.
ZyWALL VPN2S - update to 1.20(ABLN.2)_00210624C1