Remote code execution in Zyxel firewalls and access points
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | N/A |
| CWE-ID | CWE-119 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
VPN series Client/Desktop applications / Antivirus software/Personal firewalls USG series Client/Desktop applications / Antivirus software/Personal firewalls USG FLEX series Client/Desktop applications / Antivirus software/Personal firewalls Unified Pro series Hardware solutions / Other hardware appliances Unified series Hardware solutions / Other hardware appliances Standalone series Hardware solutions / Other hardware appliances |
| Vendor | ZyXEL Communications Corp. |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) Buffer overflow
EUVDB-ID: #VU48673
Risk: High
CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: N/A
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the "fbwifi_continue" CGI program. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsVPN series: 4.30 - 4.55
USG series: 4.30 - 4.55
USG FLEX series: 4.30 - 4.55
Unified Pro series: before 6.10 patch 8
Unified series: before 6.10 patch 8
Standalone series: before 6.10 patch 8
CPE2.3- cpe:2.3:a:zyxel_communications_corp:vpn_series:*:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:vpn_series:4.30:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:vpn_series:4.55:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_series:*:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_series:4.30:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_series:4.55:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_flex_series:*:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_flex_series:4.30:*:*:*:*:*:*:*
- cpe:2.3:a:zyxel_communications_corp:usg_flex_series:4.55:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:unified_pro_series:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:unified_series:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:standalone_series:*:*:*:*:*:*:*:*
https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtml
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
