High severity7.5NVD Advisory· Published Aug 24, 2026· Updated Aug 24, 2026

CVE-2026-71922

Description

Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer dereference vulnerability in the setget.cgi interface. The vulnerability is caused by missing validation when the pass field is absent. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Draytek/VigorSwitchllm-fuzzy

Patches

Vulnerability mechanics

References

www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/nvd
www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentication-null-pointer-dereference-via-setget-cginvd

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