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.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
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References
History
Mon, 24 Aug 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | DrayTek VigorSwitch Multiple Models Buffer Overflow via webBackupAction | |
| First Time appeared |
Draytek
Draytek vigorswitch Fx2120 Firmware Draytek vigorswitch G1282 Firmware Draytek vigorswitch G2100 Firmware Draytek vigorswitch G2121 Firmware Draytek vigorswitch G2280x Firmware Draytek vigorswitch G2540xs Firmware Draytek vigorswitch P1282 Firmware Draytek vigorswitch P2100 Firmware Draytek vigorswitch P2280x Firmware Draytek vigorswitch P2540xs Firmware Draytek vigorswitch Pq2121x Firmware Draytek vigorswitch Pq2200xb Firmware Draytek vigorswitch Q2121x Firmware Draytek vigorswitch Q2200x Firmware |
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| Weaknesses | CWE-120 | |
| CPEs | cpe:2.3:o:draytek:vigorswitch_fx2120_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_g1282_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_g2100_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_g2121_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_g2280x_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_g2540xs_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_p1282_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_p2100_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_p2280x_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_p2540xs_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_pq2121x_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_pq2200xb_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_q2121x_firmware:*:*:*:*:*:*:*:* cpe:2.3:o:draytek:vigorswitch_q2200x_firmware:*:*:*:*:*:*:*:* |
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| Vendors & Products |
Draytek
Draytek vigorswitch Fx2120 Firmware Draytek vigorswitch G1282 Firmware Draytek vigorswitch G2100 Firmware Draytek vigorswitch G2121 Firmware Draytek vigorswitch G2280x Firmware Draytek vigorswitch G2540xs Firmware Draytek vigorswitch P1282 Firmware Draytek vigorswitch P2100 Firmware Draytek vigorswitch P2280x Firmware Draytek vigorswitch P2540xs Firmware Draytek vigorswitch Pq2121x Firmware Draytek vigorswitch Pq2200xb Firmware Draytek vigorswitch Q2121x Firmware Draytek vigorswitch Q2200x Firmware |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-08-24T18:14:02.008Z
Reserved: 2026-08-08T16:37:44.519Z
Link: CVE-2026-71935
No data.
Status : Received
Published: 2026-08-24T18:17:18.490
Modified: 2026-08-24T18:17:18.490
Link: CVE-2026-71935
No data.
OpenCVE Enrichment
No data.
Weaknesses