CVE-2023-27992

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior toV5.21(AAZF.14)C0, NAS540 firmware versions prior toV5.21(AATB.11)C0, and NAS542firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.
OS Command Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ZyxelCNA
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVEADP
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CISA-ADPADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 99%
VendorProductVersion
zyxelnas326_firmware
𝑥
< 5.21\(aazf.14\)c0
zyxelnas540_firmware
𝑥
< 5.21\(aatb.11\)c0
zyxelnas542_firmware
𝑥
< 5.21\(abag.11\)c0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products