Buffer overflow in Zyxel Atp Series Firmware
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.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (22.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Zyxel Atp Series Firmware — versions 4.32 through 5.36 Patch 2
- Zyxel Nxc2500
- Zyxel Nxc2500 Firmware — versions 6.10(AAIG.0) through 6.10(AAIG.3)
- Zyxel Nxc2500_firmware
- Zyxel Nxc5500
- Zyxel Nxc5500 Firmware — versions 6.10(AAOS.0) through 6.10(AAOS.4)
- Zyxel Nxc5500_firmware
- Zyxel Usg_20w-vpn
- Zyxel Usg_20w-vpn_firmware
- Zyxel Usg20(w)-vpn Series Firmware — versions 4.16 through 5.36 Patch 2
Weakness classification (CWE)
References
- security@zyxel.com.tw (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-34140?
- CVE-2023-34140 is a medium-severity vulnerability in Zyxel Atp Series Firmware, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2023-07-17.
- How severe is CVE-2023-34140?
- Medium severity. CVSS v3 base score is 6.5 out of 10.