High 7.2Published Aug 24, 2026

CVE-2026-71935DrayTek VigorSwitch Multiple Models Buffer Overflow via webBackupAction

Updated under an hour ago (Oct 27, 2026, 7:23 PM 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 buffer overflow vulnerability in the webBackupAction function. The vulnerability is caused by repeated string concatenation of the pathN, valueN, key, and option fields into fixed-size stack buffers without total length checks. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.

CVSS: 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-120
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-buffer-overflow-via-webbackupaction	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.