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Vulnerability · Published Jul 17, 2023 · Assigned by Zyxel

CVE-2023-34140

Medium 6.5

In plain English

A medium-severity buffer overflow in ATP series firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 77.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
Zyxel ATP series firmware 4.32 through 5.36 Patch 2
Zyxel USG FLEX series firmware 4.50 through 5.36 Patch 2
Zyxel USG FLEX 50(W) series firmware 4.16 through 5.36 Patch 2
Zyxel USG20(W)-VPN series firmware 4.16 through 5.36 Patch 2
Zyxel VPN series firmware 4.30 through 5.36 Patch 2
Zyxel NXC2500 firmware 6.10(AAIG.0) through 6.10(AAIG.3)
Zyxel NXC5500 firmware 6.10(AAOS.0) through 6.10(AAOS.4)

Weakness: CWE-120 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References