Medium severity · published Apr 24, 2023
CVE-2023-27990
The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware…
4.8
CVSS
0.3%
EPSS
No
On KEV
Description
The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker with administrator privileges to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed when the user visits the Logs page of the GUI on the device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp100 Firmware · Zyxel
4.32 before 5.36 · source: NVD
AF
Atp100w Firmware · Zyxel
4.32 before 5.36 · source: NVD
AF
Atp200 Firmware · Zyxel
4.32 before 5.36 · source: NVD
AF
Atp500 Firmware · Zyxel
4.32 before 5.36 · source: NVD
AF
Atp700 Firmware · Zyxel
4.32 before 5.36 · source: NVD
AF
Atp800 Firmware · Zyxel
4.32 before 5.36 · source: NVD
U2
Usg 20w-vpn Firmware · Zyxel
4.16 before 5.36 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
4.50 before 5.36 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
4.50 before 5.36 · source: NVD
UF
Usg Flex 200 Firmware · Zyxel
4.50 before 5.36 · source: NVD
UF
Usg Flex 50 Firmware · Zyxel
4.50 before 5.36 · source: NVD
UF
Usg Flex 500 Firmware · Zyxel
4.50 before 5.36 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-27990
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-27990
Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls
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