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Vulnerability · Published May 24, 2022 · Assigned by Zyxel

CVE-2022-26531

Medium 6.1

In plain English

A medium-severity improper input validation 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 6.4% (higher than 94% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)6.4%top 6.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.

Affected products (as reported)

VendorProductVersions
Zyxel USG/ZyWALL series firmware 4.09 through 4.71
Zyxel USG FLEX series firmware 4.50 through 5.21
Zyxel ATP series firmware 4.32 through 5.21
Zyxel VPN series firmware 4.30 through 5.21
Zyxel NSG series firmware 1.00 through 1.33 Patch 4
Zyxel NXC2500 firmware <= 6.10(AAIG.3)
Zyxel NAP203 firmware <= 6.25(ABFA.7)
Zyxel NWA50AX firmware <= 6.25(ABYW.5)
Zyxel WAC500 firmware <= 6.30(ABVS.2)
Zyxel WAX510D firmware <= 6.30(ABTF.2)

Weakness: CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

References