High 7.5Published Aug 24, 2026

CVE-2026-71922DrayTek VigorSwitch Multiple Models Pre-Authentication NULL Pointer Dereference via setget.cgi

Updated under an hour ago (Oct 28, 2026, 6:00 AM ET)

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It affects DrayTek Corporation VigorSwitch G2540xs and 27 other products. Add what you run to find out whether that includes you.

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Every CVE for DrayTek Corporation VigorSwitch G2540xs

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Aug 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

DrayTek Corporation VigorSwitch G2540xs draytek:vigorswitch_g2540xs (from the name)	before 3.9.10	CNA record
DrayTek Corporation VigorSwitch P2540xs draytek:vigorswitch_p2540xs (from the name)	before 3.9.10	CNA record
DrayTek Corporation VigorSwitch FX2120 draytek:vigorswitch_fx2120 (from the name)	before 3.9.10	CNA record
DrayTek Corporation VigorSwitch G2282x draytek:vigorswitch_g2282x (from the name)	before 2.10.6	CNA record
DrayTek Corporation VigorSwitch P2282x draytek:vigorswitch_p2282x (from the name)	before 2.10.6	CNA record
DrayTek Corporation VigorSwitch Q2300x draytek:vigorswitch_q2300x (from the name)	before 2.10.7	CNA record
DrayTek Corporation VigorSwitch PQ2300xb draytek:vigorswitch_pq2300xb (from the name)	before 2.10.7	CNA record
DrayTek Corporation VigorSwitch G2542x draytek:vigorswitch_g2542x (from the name)	before 3.10.6	CNA record
DrayTek Corporation VigorSwitch P2542x draytek:vigorswitch_p2542x (from the name)	before 3.10.6	CNA record
DrayTek Corporation VigorSwitch P2542xh draytek:vigorswitch_p2542xh (from the name)	before 3.10.6	CNA record
1–10 of 28

References

References

https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/	vendor-advisory
https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentication-null-pointer-dereference-via-setget-cgi	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.