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CVE-2023-22916

HIGHCVSS 8.1/10EPSS 0.69%

Last modified

CVE-2023-22916 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

EPSS Probability
0.69%

48.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ZyxelUsg Flex 100 Firmware>= 5.00, <= 5.35
ZyxelUsg Flex 100w Firmware>= 5.00, <= 5.35
ZyxelUsg Flex 200 Firmware>= 5.00, <= 5.35
ZyxelUsg Flex 50 Firmware>= 5.00, <= 5.35
ZyxelUsg Flex 50w Firmware>= 5.10, <= 5.35
ZyxelUsg Flex 500 Firmware>= 5.00, <= 5.35
ZyxelUsg Flex 700 Firmware>= 5.00, <= 5.35
ZyxelVpn100 Firmware>= 5.00, <= 5.35
ZyxelVpn1000 Firmware>= 5.00, <= 5.35
ZyxelVpn300 Firmware>= 5.00, <= 5.35
ZyxelVpn50 Firmware>= 5.00, <= 5.35
ZyxelUsg 20w-Vpn Firmware>= 5.10, <= 5.35
ZyxelAtp100 Firmware>= 5.10, <= 5.35
ZyxelAtp100w Firmware>= 5.10, <= 5.35
ZyxelAtp200 Firmware>= 5.10, <= 5.35
ZyxelAtp500 Firmware>= 5.10, <= 5.35
ZyxelAtp700 Firmware>= 5.10, <= 5.35
ZyxelAtp800 Firmware>= 5.10, <= 5.35

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-22916?
The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.
How severe is CVE-2023-22916?
CVE-2023-22916 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.
How do I fix CVE-2023-22916?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST