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CVE-2026-71933— DrayTek VigorSwitch Multiple Models Missing Authorization in Syslog Functions

Quick assessment

Affected
DrayTek Corporation VigorSwitch G2540xs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DrayTek VigorSwitch是中国DrayTek公司的一款网络交换机。 DrayTek VigorSwitch存在授权问题漏洞，该漏洞源于多个syslog函数缺少授权检查，可能导致远程攻击者通过特制请求修改配置、重启服务、保存启动配置或清除日志。

CVSS 9.1 · Critical EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1491.002 · External Defacement

Affected Version Matrix 28

VendorProduct Version RangeStatus
DrayTek Corporation VigorSwitch FX2120 < 3.9.10 affected
DrayTek Corporation VigorSwitch G1280 < 2.9.10 affected
DrayTek Corporation VigorSwitch G1282 < 2.9.10 affected
DrayTek Corporation VigorSwitch G2100 < 2.9.10 affected
DrayTek Corporation VigorSwitch G2121 < 2.9.10 affected
DrayTek Corporation VigorSwitch G2280x < 2.9.10 affected
DrayTek Corporation VigorSwitch G2282x < 2.10.6 affected
DrayTek Corporation VigorSwitch G2540x < 2.9.10 affected
DrayTek Corporation VigorSwitch G2540xs < 3.9.10 affected
DrayTek Corporation VigorSwitch G2542x < 3.10.6 affected
DrayTek Corporation VigorSwitch P1280 < 2.9.10 affected
DrayTek Corporation VigorSwitch P1281x < 2.9.10 affected
DrayTek Corporation VigorSwitch P1282 < 2.9.10 affected
DrayTek Corporation VigorSwitch P2100 < 2.9.10 affected
DrayTek Corporation VigorSwitch P2121 < 2.9.10 affected
DrayTek Corporation VigorSwitch P2280x < 2.9.10 affected
DrayTek Corporation VigorSwitch P2282x < 2.10.6 affected
DrayTek Corporation VigorSwitch P2540x < 2.9.10 affected
DrayTek Corporation VigorSwitch P2540xs < 3.9.10 affected
DrayTek Corporation VigorSwitch P2542x < 3.10.6 affected
DrayTek Corporation VigorSwitch P2542xh < 3.10.6 affected
DrayTek Corporation VigorSwitch PQ2121x < 2.9.10 affected
DrayTek Corporation VigorSwitch PQ2200xb < 2.9.10 affected
DrayTek Corporation VigorSwitch PQ2300xb < 2.10.7 affected
DrayTek Corporation VigorSwitch PX2060 < 2.9.10 affected
DrayTek Corporation VigorSwitch Q2121x < 2.9.10 affected
DrayTek Corporation VigorSwitch Q2200x < 2.9.10 affected
DrayTek Corporation VigorSwitch Q2300x < 2.10.7 affected
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I. Basic Information for CVE-2026-71933

Vulnerability Information
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Vulnerability Title
DrayTek VigorSwitch Multiple Models Missing Authorization in Syslog Functions
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple DrayTek VigorSwitch models contain unauthorized operation vulnerabilities in multiple syslog functions. The vulnerability is caused by missing authorization checks. A remote attacker can trigger these vulnerabilities via crafted requests to modify configuration, restart services, save startup configuration, or clear logs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
DrayTek VigorSwitch 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DrayTek VigorSwitch是中国DrayTek公司的一款网络交换机。 DrayTek VigorSwitch存在授权问题漏洞，该漏洞源于多个syslog函数缺少授权检查，可能导致远程攻击者通过特制请求修改配置、重启服务、保存启动配置或清除日志。
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
DrayTek Corporation VigorSwitch G2540xs 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch P2540xs 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch FX2120 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch G2282x 0 ~ 2.10.6 -
DrayTek Corporation VigorSwitch P2282x 0 ~ 2.10.6 -
DrayTek Corporation VigorSwitch Q2300x 0 ~ 2.10.7 -
DrayTek Corporation VigorSwitch PQ2300xb 0 ~ 2.10.7 -
DrayTek Corporation VigorSwitch G2542x 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch P2542x 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch P2542xh 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch PX2060 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G1280 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1280 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1281x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G1282 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1282 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2121 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2121 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch PQ2121x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch Q2121x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2280x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2280x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch Q2200x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch PQ2200xb 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2100 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2100 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2540x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2540x 0 ~ 2.9.10 -

II. Public POCs for CVE-2026-71933

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-71933

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Vendor Advisories for CVE-2026-71933 (2)

Same Patch Batch · DrayTek Corporation · 2026-08-24 · 40 CVEs total

CVE-2026-71914 9.8 CRITICAL DrayTek VigorAP Multiple Models Pre-Authentication OS Command Injection via dray_apm
CVE-2026-71921 9.8 CRITICAL DrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgi
CVE-2026-71922 7.5 HIGH DrayTek VigorSwitch Multiple Models Pre-Authentication NULL Pointer Dereference via setget
CVE-2026-71915 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via jsonstatus
CVE-2026-71924 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via getVid
CVE-2026-71919 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via sysreboot
CVE-2026-71910 7.2 HIGH DrayTek VigorAP Multiple Models OS Command Injection via apautotest
CVE-2026-71906 7.2 HIGH DrayTek VigorAP Multiple Models OS Command Injection via setLan
CVE-2026-71912 7.2 HIGH DrayTek VigorAP Multiple Models Buffer Overflow via apautotest
CVE-2026-71917 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via pingtrace
CVE-2026-71907 7.2 HIGH DrayTek VigorAP Multiple Models OS Command Injection via setcamset
CVE-2026-71934 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via pingtrace
CVE-2026-71905 7.2 HIGH DrayTek VigorAP Multiple Models OS Command Injection via ExportSettings
CVE-2026-71923 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via auth_set
CVE-2026-71935 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via webBackupAction
CVE-2026-71941 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail
CVE-2026-71938 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via switch_lan_gvrp
CVE-2026-71939 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Add ACE
CVE-2026-71918 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via webBackupAction
CVE-2026-71909 7.2 HIGH DrayTek VigorAP Multiple Models OS Command Injection via InquierTime

Showing top 20 of 40 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: VigorSwitch G2540xs
Same vendor: DrayTek Corporation
Same weakness: CWE-862

V. Comments for CVE-2026-71933

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