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Vulnerability · Published Nov 28, 2023 · Assigned by Zyxel

CVE-2023-35139

Medium 5.2

In plain English

A medium-severity cross-site scripting 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 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)5.2Medium
Exploit odds (30 days)0.5%top 59.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs.

Affected products (as reported)

VendorProductVersions
Zyxel ATP series firmware versions 5.10 through 5.37
Zyxel USG FLEX series firmware versions 5.00 through 5.37
Zyxel USG FLEX 50(W) series firmware versions 5.10 through 5.37
Zyxel USG20(W)-VPN series firmware versions 5.10 through 5.37
Zyxel VPN series firmware versions 5.00 through 5.37

Weakness: CWE-79 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References