High severity · published Jul 17, 2023
CVE-2023-34139
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…
8.8
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
U2
Usg 2200-vpn Firmware · Zyxel
4.20 before 5.37 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 200 Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 50 Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 500 Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 50w Firmware · Zyxel
4.50 before 5.37 · source: NVD
UF
Usg Flex 700 Firmware · Zyxel
4.50 before 5.37 · source: NVD
ZV
Zywall Vpn 100 Firmware · Zyxel
4.20 before 5.37 · source: NVD
ZV
Zywall Vpn 300 Firmware · Zyxel
4.20 before 5.37 · source: NVD
ZV
Zywall Vpn 50 Firmware · Zyxel
4.20 before 5.37 · source: NVD
ZV
Zywall Vpn100 Firmware · Zyxel
4.20 before 5.37 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-34139
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-34139
Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers
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