Vulnerability · Published Jul 2, 2021 · Assigned by Zyxel
CVE-2021-35029
Critical 9.8
In plain English
A critical-severity improper authentication in ATP series Firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.3% (higher than 83% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)2.3%top 17.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote attacker to execute arbitrary commands on an affected device.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | USG/Zywall series Firmware | 4.35 through 4.64 |
| Zyxel | USG FLEX series Firmware | 4.35 through 5.01 |
| Zyxel | ATP series Firmware | 4.35 through 5.01 |
| Zyxel | VPN series Firmware | 4.35 through 5.01 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H