CVE-2023-28771
CVSS v3
9.8
CRITICAL
EPSS Score
94.3 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2023-05-31
- Patch Due Date
- 2023-06-21
- Ransomware Use
- Unknown
Technical details
- Published
- 2023-04-25
Frequently asked questions
What is CVE-2023-28771?
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.
Is CVE-2023-28771 actively exploited?
Yes. CVE-2023-28771 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-06-21.
What is the CVSS score for CVE-2023-28771?
CVE-2023-28771 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2023-28771 affecting your environment?
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