Zyxel security advisory for directory traversal and command injection vulnerabilities of VPN2S





CVE: CVE-2021-35027, CVE-2021-35028
Summary
Zyxel has released a patch addressing directory traversal and command injection vulnerabilities in the VPN2S firewall. Users are advised to install it for optimal protection.
What is the vulnerability?
A directory traversal vulnerability caused by specific character sequences within an improperly sanitized URL was identified in the VPN2S firewall. A command injection vulnerability caused by improper filtering for the parameters in a CGI program was also identified.
What versions are vulnerable—and what should you do?
After a thorough investigation, we’ve identified one vulnerable product that is within its warranty and support period and released a hotfix to address the issue, as shown in the table below.
Affected model | Hotfix availability |
ZyWALL VPN2S |
Got a question or a tipoff?
Please contact your local service rep or comment below for further information or assistance.
Acknowledgment
Thanks to Qihoo 360 for reporting the issues to us.
Revision history
2021-09-30: Initial release
Categories
- All Categories
- 431 Beta Program
- 2.6K Nebula
- 164 Nebula Ideas
- 112 Nebula Status and Incidents
- 6K Security
- 364 USG FLEX H Series
- 292 Security Ideas
- 1.5K Switch
- 78 Switch Ideas
- 1.2K Wireless
- 42 Wireless Ideas
- 6.6K Consumer Product
- 262 Service & License
- 407 News and Release
- 87 Security Advisories
- 31 Education Center
- 10 [Campaign] Zyxel Network Detective
- 3.9K FAQ
- 34 Documents
- 34 Nebula Monthly Express
- 85 About Community
- 83 Security Highlight