CVE-2023-34140 — MEDIUM (6.5)

Q: How severe is CVE-2023-34140?

CVE-2023-34140 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2023-34140?

Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Usg 20W-Vpn Firmware, Zyxel Usg 20W-Vpn, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg 2200-Vpn, Zyxel Usg Flex 100 Firmware.

Vulnerability Description

A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 4.16 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 4.16 through 5.36 Patch 2, VPN series firmware versions 4.30 through 5.36 Patch 2, NXC2500 firmware versions 6.10(AAIG.0) through 6.10(AAIG.3), and NXC5500 firmware versions 6.10(AAOS.0) through 6.10(AAOS.4), could allow an unauthenticated, LAN-based attacker to cause denial of service (DoS) conditions by sending a crafted request to the CAPWAP daemon.

CVSS Score

6.5

MEDIUM

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

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Zyxel	Usg 20W-Vpn Firmware	>= 4.16, < 5.37
Zyxel	Usg 20W-Vpn	-
Zyxel	Usg 2200-Vpn Firmware	>= 4.30, < 5.37
Zyxel	Usg 2200-Vpn	-
Zyxel	Usg Flex 100 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100	-
Zyxel	Usg Flex 100W Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100W	-
Zyxel	Usg Flex 200 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 200	-
Zyxel	Usg Flex 50 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 50	-
Zyxel	Usg Flex 500 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 500	-
Zyxel	Usg Flex 50W Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 50W	-
Zyxel	Usg Flex 700 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 700	-
Zyxel	Zywall Atp100 Firmware	>= 4.32, < 5.37
Zyxel	Zywall Atp100	-

Related Weaknesses (CWE)

CWE-120

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisVendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisVendor Advisory

FAQ

What is CVE-2023-34140?

CVE-2023-34140 is a vulnerability with a CVSS score of 6.5 (MEDIUM). A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50(W) series firmware versio...

How severe is CVE-2023-34140?

CVE-2023-34140 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-34140?

Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Usg 20W-Vpn Firmware, Zyxel Usg 20W-Vpn, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg 2200-Vpn, Zyxel Usg Flex 100 Firmware.