CVE-2026-71942
8.6
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
Summary
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the mail_mailalert function. The vulnerability is caused by concatenating multiple smtpReceiver email addresses into a fixed-size buffer without checking the remaining buffer size. 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| DrayTek Corporation | VigorSwitch G2540xs | 0 < 3.9.10 | affected |
| DrayTek Corporation | VigorSwitch P2540xs | 0 < 3.9.10 | affected |
| DrayTek Corporation | VigorSwitch FX2120 | 0 < 3.9.10 | affected |
| DrayTek Corporation | VigorSwitch G2282x | 0 < 2.10.6 | affected |
| DrayTek Corporation | VigorSwitch P2282x | 0 < 2.10.6 | affected |
| DrayTek Corporation | VigorSwitch Q2300x | 0 < 2.10.7 | affected |
| DrayTek Corporation | VigorSwitch PQ2300xb | 0 < 2.10.7 | affected |
| DrayTek Corporation | VigorSwitch G2542x | 0 < 3.10.6 | affected |
| DrayTek Corporation | VigorSwitch P2542x | 0 < 3.10.6 | affected |
| DrayTek Corporation | VigorSwitch P2542xh | 0 < 3.10.6 | affected |
| DrayTek Corporation | VigorSwitch PX2060 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G1280 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P1280 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P1281x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G1282 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P1282 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G2121 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P2121 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch PQ2121x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch Q2121x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G2280x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P2280x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch Q2200x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch PQ2200xb | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G2100 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P2100 | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch G2540x | 0 < 2.9.10 | affected |
| DrayTek Corporation | VigorSwitch P2540x | 0 < 2.9.10 | affected |
Weaknesses
- CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
- https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/
- https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-mail-mailalert
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.