CVE-2023-34140 Memory corruption in ATP series firmware
An unauthenticated LAN attacker can cause denial of service in Zyxel network devices by sending a crafted request to the CAPWAP daemon.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-34140?
CVE-2023-34140 is a medium-severity memory corruption vulnerability in Zyxel ATP series firmware, published on 17 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2023-34140?
It affects 24 products.
Products include Zyxel Nxc2500 Firmware, Zyxel Nxc5500 Firmware, Zyxel Usg 20w-Vpn Firmware, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100w Firmware and 18 more.
How do I fix CVE-2023-34140?
No fix has been published for CVE-2023-34140 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-34140 being exploited?
There is no known exploitation of CVE-2023-34140 in the wild and no public exploit code.
Other vulnerabilities in Zyxel ATP series firmware
Sources
Also known as GHSA-65px-649g-rj37.