CVE-2022-26531

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL...

6.1 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: High

Exploit likelihood

6.37%Up 5.5 points since May 24, 2022

What each source reports

CVE List Score used 6.1

Record: CVE-2022-26531
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Weakness: CWE-20
Updated: 2026-11-02

EUVDEUVD-2022-31088 6.1

Record: EUVD-2022-31088
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rg7w-p5vw-jmcc 7.8

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL...

Record: GHSA-rg7w-p5vw-jmcc
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-20
Updated: 2026-11-02

NVD 6.1

Record: CVE-2022-26531
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-20
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2022-26531 is a medium vulnerability (CVSS 6.1) in Zyxel Atp Series Firmware, published May 24, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.37%, the 93rd percentile. No source names a fixed version.