CVE-2026-71931: high-severity vulnerability in DrayTek Corporation VigorSwitch FX2120
DrayTek VigorSwitch Multiple Models OS Command Injection via tftp_upgrade
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 1.8%
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the tftp_upgrade function. The vulnerability is caused by insufficient filtering before the filename field is concatenated into a command. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
DrayTek Corporation · VigorSwitch FX2120DrayTek Corporation · VigorSwitch G1280DrayTek Corporation · VigorSwitch G1282DrayTek Corporation · VigorSwitch G2100DrayTek Corporation · VigorSwitch G2121DrayTek Corporation · VigorSwitch G2280xDrayTek Corporation · VigorSwitch G2282xDrayTek Corporation · VigorSwitch G2540xDrayTek Corporation · VigorSwitch G2540xsDrayTek Corporation · VigorSwitch G2542xDrayTek Corporation · VigorSwitch P1280DrayTek Corporation · VigorSwitch P1281xDrayTek Corporation · VigorSwitch P1282DrayTek Corporation · VigorSwitch P2100DrayTek Corporation · VigorSwitch P2121DrayTek Corporation · VigorSwitch P2280xDrayTek Corporation · VigorSwitch P2282xDrayTek Corporation · VigorSwitch P2540xDrayTek Corporation · VigorSwitch P2540xsDrayTek Corporation · VigorSwitch P2542xDrayTek Corporation · VigorSwitch P2542xhDrayTek Corporation · VigorSwitch PQ2121xDrayTek Corporation · VigorSwitch PQ2200xbDrayTek Corporation · VigorSwitch PQ2300xbDrayTek Corporation · VigorSwitch PX2060DrayTek Corporation · VigorSwitch Q2121xDrayTek Corporation · VigorSwitch Q2200xDrayTek Corporation · VigorSwitch Q2300xRelated CVEs — DrayTek Corporation VigorSwitch FX2120
In the same product, most dangerous first.
CVE-2026-71921CRITICALDrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgiEPSS 2.8%CVE-2026-71943HIGHDrayTek VigorSwitch Multiple Models OS Command Injection via setDevNetEPSS 2.3%CVE-2026-71930HIGHDrayTek VigorSwitch Multiple Models OS Command Injection via setTimeEPSS 2.3%CVE-2026-71929HIGHDrayTek VigorSwitch Multiple Models OS Command Injection via setDevProtoEPSS 2.3%CVE-2026-71928HIGHDrayTek VigorSwitch Multiple Models OS Command Injection via fdftDeviceEPSS 2.3%CVE-2026-71927HIGHDrayTek VigorSwitch Multiple Models OS Command Injection via rebDeviceEPSS 2.3%