CVE-2026-71938
Authenticated buffer overflow in DrayTek VigorSwitch web UI; DoS or RCE.
Is CVE-2026-71938 being exploited?
Not confirmed. CVE-2026-71938 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-71938?
CVE-2026-71938 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-71938?
Not known from our data. No patch reference has been recorded for CVE-2026-71938, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-71938 affect?
CVE-2026-71938 affects DrayTek VigorSwitch series (multiple models), Device web management interface (HTTP/HTTPS). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71938?
Restrict admin web access, rotate admin credentials, apply vendor firmware update when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
With valid admin credentials, a remote attacker can trigger a buffer overflow via the web UI to cause DoS or potentially execute arbitrary commands.
Immediate action required
- affected< 3.9.10
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As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.