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CVE-2026-71912: DrayTek VigorAP Multiple Models Buffer Overflow via apautotest

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-13
• Weakness: CWE-120

Description

Multiple DrayTek VigorAP models contain a buffer overflow vulnerability in the apautotest function. The vulnerability is caused by missing length checks during memory copy operations involving the CMD6 field. 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 products

• DrayTek Corporation VigorAP 1060C: before 1.4.12 — fixed in 1.4.12
• DrayTek Corporation VigorAP 903: before 1.4.22 — fixed in 1.4.22
• DrayTek Corporation VigorAP 906: before 1.4.13 — fixed in 1.4.13
• DrayTek Corporation VigorAP 912C: before 1.4.15 — fixed in 1.4.15
• DrayTek Corporation VigorAP 918R: before 1.4.11 — fixed in 1.4.11
• DrayTek Corporation VigorAP 960C: before 1.4.12 — fixed in 1.4.12

How to fix

Upgrade to a fixed version: DrayTek Corporation VigorAP 1060C 1.4.12; DrayTek Corporation VigorAP 903 1.4.22; DrayTek Corporation VigorAP 906 1.4.13; DrayTek Corporation VigorAP 912C 1.4.15; DrayTek Corporation VigorAP 918R 1.4.11; DrayTek Corporation VigorAP 960C 1.4.12. Check the vendor advisory for mitigations.

References

• https://www.draytek.com/about/security-advisory/multiple-remote-code-execution-and-buffer-overflow-vulnerabilities-in-vigorap-series-august-2026/
• https://www.vulncheck.com/advisories/draytek-vigorap-multiple-models-buffer-overflow-via-apautotest

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