by Kastro
Paper/Archive/CVE-2026-71921

CVE-2026-71921

DrayTek Corporation VigorSwitch G2540xs — DrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgi

EPSS 3%CVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 86.4.864 × 2017.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
VigorSwitch G2540xs< 3.9.103.9.10CNA
VigorSwitch P2540xs< 3.9.103.9.10CNA
VigorSwitch FX2120< 3.9.103.9.10CNA
VigorSwitch G2282x< 2.10.62.10.6CNA
VigorSwitch P2282x< 2.10.62.10.6CNA
VigorSwitch Q2300x< 2.10.72.10.7CNA
VigorSwitch PQ2300xb< 2.10.72.10.7CNA
VigorSwitch G2542x< 3.10.63.10.6CNA
VigorSwitch P2542x< 3.10.63.10.6CNA
VigorSwitch P2542xh< 3.10.63.10.6CNA
VigorSwitch PX2060< 2.9.102.9.10CNA
VigorSwitch G1280< 2.9.102.9.10CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)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
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorydraytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026writeupvulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentication-os-command-injection-via-setget-cgi