Command Injection Vulnerability in DrayTek VigorSwitch Models
CVE-2026-71923

8.6HIGH

Key Information:

Vendor

Draytek Corporation

Status
Vigorswitch G2540xs
Vigorswitch P2540xs
Vigorswitch Fx2120
Vigorswitch G2282x
Vendor
CVE Published:
24 August 2026

What is CVE-2026-71923?

Multiple models of DrayTek's VigorSwitch series are susceptible to a command injection vulnerability arising from inadequate filtering in the auth_set function. This flaw allows remote attackers, equipped with valid administrative credentials, to send specially crafted input that can lead to the execution of arbitrary commands with elevated privileges. It's crucial for organizations utilizing affected VigorSwitch models to review their security settings and apply necessary patches to prevent potential exploitation via the device's web management interface.

Affected Version(s)

VigorSwitch FX2120 0 < 3.9.10

VigorSwitch G1280 0 < 2.9.10

VigorSwitch G1282 0 < 2.9.10

References

https://www.draytek.com/about/security-advisory/multiple-...
vendor-advisory
https://www.vulncheck.com/advisories/draytek-vigorswitch-...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jincheng Wang (@winmt)
Le Yu (Nanjing University of Posts and Telecommunications)
Xiapu Luo (The Hong Kong Polytechnic University)
.