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CVE-2022-26531

Quick assessment

Affected
Zyxel USG/ZyWALL series firmware
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zyxel USG/ZyWALL是中国合勤科技（Zyxel）公司的一款防火墙。 Zyxel USG/ZyWALL 4.09 - 4.71、USG FLEX 4.50 - 5.21、ATP 4.32 - 5.21、VPN 4.30 - 5.21、NSG 1.00 - 1.33 Patch 4、NXC2500 6.10(AAIG.3)及之前版本、NAP203 6.25(ABFA.7) 及之前版本、NWA50AX 6.25(ABYW.5) 及之前版本、WAC500 6.30(ABVS.2) 及之前版本， WAX

CVSS 6.1 · Medium EPSS 6.17% · P93

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-26531

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Zyxel USG/ZyWALL 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zyxel USG/ZyWALL是中国合勤科技（Zyxel）公司的一款防火墙。 Zyxel USG/ZyWALL 4.09 - 4.71、USG FLEX 4.50 - 5.21、ATP 4.32 - 5.21、VPN 4.30 - 5.21、NSG 1.00 - 1.33 Patch 4、NXC2500 6.10(AAIG.3)及之前版本、NAP203 6.25(ABFA.7) 及之前版本、NWA50AX 6.25(ABYW.5) 及之前版本、WAC500 6.30(ABVS.2) 及之前版本， WAX
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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) -

II. Public POCs for CVE-2022-26531

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III. Intelligence Information for CVE-2022-26531

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Exploits & Public PoCs for CVE-2022-26531 (2)

Mailing List Discussions for CVE-2022-26531 (1)

Other References for CVE-2022-26531 (1)

Same Patch Batch · Zyxel · 2022-05-24 · 4 CVEs total

CVE-2022-26532 7.8 HIGH Zyxel USG/ZyWALL 操作系统命令注入漏洞
CVE-2022-0910 6.5 MEDIUM Zyxel USG/ZyWALL 授权问题漏洞
CVE-2022-0734 5.8 MEDIUM Zyxel USG/ZyWALL 跨站脚本漏洞

IV. Related Vulnerabilities

Same product: USG/ZyWALL series firmware
Same vendor: Zyxel
Same weakness: CWE-20

V. Comments for CVE-2022-26531

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