CVE-2026-71921

Received
Published: 24 Aug 2026, 17:07
Last modified:24 Aug 2026, 17:07

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (cve.org)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Aug 2026, 17:07
Published
Vulnerability first disclosed

Description

Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges.

CVSS Metrics

  • v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Techniques & Countermeasures

  • CWE-78•Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

    The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Affected Systems

  • draytek corporation•vigorswitch fx2120

    < 3.9.10

  • draytek corporation•vigorswitch g1280

    < 2.9.10

  • draytek corporation•vigorswitch g1282

    < 2.9.10

  • draytek corporation•vigorswitch g2100

    < 2.9.10

  • draytek corporation•vigorswitch g2121

    < 2.9.10

  • draytek corporation•vigorswitch g2280x

    < 2.9.10

  • draytek corporation•vigorswitch g2282x

    < 2.10.6

  • draytek corporation•vigorswitch g2540x

    < 2.9.10

  • draytek corporation•vigorswitch g2540xs

    < 3.9.10

  • draytek corporation•vigorswitch g2542x

    < 3.10.6

  • draytek corporation•vigorswitch p1280

    < 2.9.10

  • draytek corporation•vigorswitch p1281x

    < 2.9.10

  • draytek corporation•vigorswitch p1282

    < 2.9.10

  • draytek corporation•vigorswitch p2100

    < 2.9.10

  • draytek corporation•vigorswitch p2121

    < 2.9.10

  • draytek corporation•vigorswitch p2280x

    < 2.9.10

  • draytek corporation•vigorswitch p2282x

    < 2.10.6

  • draytek corporation•vigorswitch p2540x

    < 2.9.10

  • draytek corporation•vigorswitch p2540xs

    < 3.9.10

  • draytek corporation•vigorswitch p2542x

    < 3.10.6

  • draytek corporation•vigorswitch p2542xh

    < 3.10.6

  • draytek corporation•vigorswitch pq2121x

    < 2.9.10

  • draytek corporation•vigorswitch pq2200xb

    < 2.9.10

  • draytek corporation•vigorswitch pq2300xb

    < 2.10.7

  • draytek corporation•vigorswitch px2060

    < 2.9.10

  • draytek corporation•vigorswitch q2121x

    < 2.9.10

  • draytek corporation•vigorswitch q2200x

    < 2.9.10

  • draytek corporation•vigorswitch q2300x

    < 2.10.7

References (2)