SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2023-27991

The post-authentication command injection vulnerability in the CLI command of 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…

HIGH 8.8EPSS 1.45%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

The post-authentication command injection vulnerability in the CLI command of 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 to execute some OS commands remotely.

CVSS 3.1
8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
1.45% probability · 72th percentile
CISA KEV
Not listed
Weakness
CWE-78
Affected
zyxel/atp200 firmware · zyxel/atp100 firmware · zyxel/atp700 firmware · zyxel/atp500 firmware · zyxel/atp100w firmware · zyxel/atp800 firmware · zyxel/usg flex 100 firmware · zyxel/usg flex 50 firmware · zyxel/usg flex 200 firmware · zyxel/usg flex 500 firmware · zyxel/usg flex 700 firmware · zyxel/usg flex 100w firmware · zyxel/usg 20w-vpn firmware · zyxel/usg flex 50w firmware · zyxel/usg20-vpn firmware · zyxel/vpn100 firmware · zyxel/vpn1000 firmware · zyxel/vpn300 firmware · zyxel/vpn50 firmware
Source
security@zyxel.com.tw

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.