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CVE-2023-34140

MEDIUMCVSS 6.5/10EPSS 0.27%

Last modified

CVE-2023-34140 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
0.27%

18.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ZyxelUsg 20w-Vpn Firmware>= 4.16, < 5.37
ZyxelUsg 2200-Vpn Firmware>= 4.30, < 5.37
ZyxelUsg Flex 100 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 100w Firmware>= 4.50, < 5.37
ZyxelUsg Flex 200 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 50 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 500 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 50w Firmware>= 4.50, < 5.37
ZyxelUsg Flex 700 Firmware>= 4.50, < 5.37
ZyxelZywall Atp100 Firmware>= 4.32, < 5.37
ZyxelZywall Atp100w Firmware>= 4.32, < 5.37
ZyxelZywall Atp200 Firmware>= 4.32, < 5.37
ZyxelZywall Atp500 Firmware>= 4.32, < 5.37
ZyxelZywall Atp700 Firmware>= 4.32, < 5.37
ZyxelZywall Atp800 Firmware>= 4.32, < 5.37
ZyxelZywall Vpn100 Firmware>= 4.30, < 5.37
ZyxelZywall Vpn2s Firmware>= 4.30, < 5.37
ZyxelZywall Vpn300 Firmware>= 4.30, < 5.37
ZyxelZywall Vpn50 Firmware>= 4.30, < 5.37
ZyxelZywall Vpn 100 Firmware>= 4.30, < 5.37
ZyxelZywall Vpn 300 Firmware>= 4.30, < 5.37
ZyxelZywall Vpn 50 Firmware>= 4.30, < 5.37
ZyxelNxc2500 Firmware>= 6.10\(aaig.0\), <= 6.10\(aaig.3\)
ZyxelNxc5500 Firmware>= 6.10\(aaos.0\), <= 6.10\(aaos.4\)

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-34140?
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.
How severe is CVE-2023-34140?
CVE-2023-34140 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2023-34140?
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.

Are you affected by CVE-2023-34140?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST