Critical severity · published Apr 25, 2023
CVE-2023-28771
Zyxel Multiple Firewalls OS Command Injection Vulnerability
In wildKEV
9.8
CVSS
99.3%
EPSS
Yes
On KEV
Description
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)99.3% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed May 31, 2023
Federal remediation dueJun 21, 2023
Ransomware campaign useNot known
Affected products
Which versions
AS
ATP series firmware · Zyxel
4.60 through 5.35 · source: vendor
UF
USG FLEX series firmware · Zyxel
4.60 through 5.35 · source: vendor
VS
VPN series firmware · Zyxel
4.60 through 5.35 · source: vendor
ZS
ZyWALL/USG series firmware · Zyxel
4.60 through 4.73 · source: vendor
AF
Atp100 Firmware · Zyxel
4.60 before 5.36 · source: NVD
AF
Atp100w Firmware · Zyxel
4.60 before 5.35 · source: NVD
AF
Atp200 Firmware · Zyxel
4.60 before 5.36 · source: NVD
AF
Atp500 Firmware · Zyxel
4.60 before 5.36 · source: NVD
AF
Atp700 Firmware · Zyxel
4.60 before 5.36 · source: NVD
AF
Atp800 Firmware · Zyxel
4.60 before 5.36 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
4.60 before 5.36 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
4.60 before 5.36 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-28771
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-28771
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
www.zyxel.com
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls
packetstormsecurity.com
http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html
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