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CVE-2026-71921

CRITICALCVSS 9.8/10EPSS 3.25%

Last modified

CVE-2026-71921 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 3.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0
9.3/10

CVSS: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

EPSS Probability
3.25%

87.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
DrayTek CorporationVigorSwitch G2540xs< 3.9.10
DrayTek CorporationVigorSwitch P2540xs< 3.9.10
DrayTek CorporationVigorSwitch FX2120< 3.9.10
DrayTek CorporationVigorSwitch G2282x< 2.10.6
DrayTek CorporationVigorSwitch P2282x< 2.10.6
DrayTek CorporationVigorSwitch Q2300x< 2.10.7
DrayTek CorporationVigorSwitch PQ2300xb< 2.10.7
DrayTek CorporationVigorSwitch G2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542xh< 3.10.6
DrayTek CorporationVigorSwitch PX2060< 2.9.10
DrayTek CorporationVigorSwitch G1280< 2.9.10
DrayTek CorporationVigorSwitch P1280< 2.9.10
DrayTek CorporationVigorSwitch P1281x< 2.9.10
DrayTek CorporationVigorSwitch G1282< 2.9.10
DrayTek CorporationVigorSwitch P1282< 2.9.10
DrayTek CorporationVigorSwitch G2121< 2.9.10
DrayTek CorporationVigorSwitch P2121< 2.9.10
DrayTek CorporationVigorSwitch PQ2121x< 2.9.10
DrayTek CorporationVigorSwitch Q2121x< 2.9.10
DrayTek CorporationVigorSwitch G2280x< 2.9.10
DrayTek CorporationVigorSwitch P2280x< 2.9.10
DrayTek CorporationVigorSwitch Q2200x< 2.9.10
DrayTek CorporationVigorSwitch PQ2200xb< 2.9.10
DrayTek CorporationVigorSwitch G2100< 2.9.10
DrayTek CorporationVigorSwitch P2100< 2.9.10
DrayTek CorporationVigorSwitch G2540x< 2.9.10
DrayTek CorporationVigorSwitch P2540x< 2.9.10

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2026-71921?
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.
How severe is CVE-2026-71921?
CVE-2026-71921 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.25% probability of exploitation in the next 30 days.
How do I fix CVE-2026-71921?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST