What’s Vulnerable › Vulnerabilities

CVE-2018-9129

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-15 · updated 2026-06-17

Description

ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.

Affected products

• Zyxel Usg 1100 Firmware: all versions
• Zyxel Usg 110 Firmware: all versions
• Zyxel Usg 1900 Firmware: all versions
• Zyxel USG 20(W)-VPN firmware: all versions
• Zyxel Usg 20W Firmware: all versions
• Zyxel Usg 2200-Vpn Firmware: all versions
• Zyxel Usg 310 Firmware: all versions
• Zyxel Usg 40 Firmware: all versions
• Zyxel Usg 40W Firmware: all versions
• Zyxel Usg 60 Firmware: all versions
• Zyxel Usg 60W Firmware: all versions
• Zyxel Zywall 1100 Firmware: all versions
• Zyxel Zywall 110 Firmware: all versions
• Zyxel Zywall 310 Firmware: all versions
• Zyxel Zywall Vpn 100 Firmware: all versions
• Zyxel Zywall Vpn 300 Firmware: all versions
• Zyxel Zywall Vpn 50 Firmware: all versions

References

• https://web-in-security.blogspot.com/2018/08/practical-bleichenbacher-attacks-on-ipsec-ike.html
• https://www.zyxel.com/support/bleichenbacher_attack_vulnerability.shtml
• https://web-in-security.blogspot.com/2018/08/practical-bleichenbacher-attacks-on-ipsec-ike.html
• https://www.zyxel.com/support/bleichenbacher_attack_vulnerability.shtml

Get alerted when CVE-2018-9129 or the next vulnerability affects your stack