CVE-2026-9405
OS command injection in Totolink A8000RU Web UI enables remote RCE
Is CVE-2026-9405 being exploited?
Not confirmed. CVE-2026-9405 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 1.7% probability of exploitation in the next 30 days.
How severe is CVE-2026-9405?
CVE-2026-9405 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-2026-9405?
Not known from our data. No patch reference has been recorded for CVE-2026-9405, 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-2026-9405 affect?
CVE-2026-9405 affects Totolink A8000RU Web Management Interface (/cgi-bin/cstecgi.cgi). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-9405?
Apply firmware update when available; restrict Web UI access to LAN only.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote OS command execution via manipulated enable parameter in /cgi-bin/cstecgi.cgi; attacker can run commands on the device.
Immediate action required
- affected7.1cu.643_b20200521
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.