Vulnerability · Published Jul 17, 2023 · Assigned by Zyxel
CVE-2023-34139
High 8.8
In plain English
A high-severity OS command injection in USG FLEX 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 0.8% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 44.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | USG FLEX series firmware | 4.50 through 5.36 Patch 2 |
| Zyxel | VPN series firmware | 4.20 through 5.36 Patch 2 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H