CVE-2026-15701
Remote stack-based buffer overflow in Totolink NR1800X lighttpd via Host header.
Is CVE-2026-15701 being exploited?
Not confirmed. CVE-2026-15701 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 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-15701?
CVE-2026-15701 is rated High with a CVSS score of 8.9. 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-2026-15701?
Not known from our data. No patch reference has been recorded for CVE-2026-15701, 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-2026-15701 affect?
CVE-2026-15701 affects Totolink NR1800X firmware 9.1.0u.6279_B20210910, lighttpd (formLogout.htm). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-15701?
Isolate devices, block remote management, and apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote stack-based buffer overflow via Host header in /formLogout.htm may enable remote code execution or full device compromise.
Immediate action required
- affected9.1.0u.6279_B20210910
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.