CVE-2026-9457
Remote OS command injection in Totolink A8000RU Web UI via UploadFirmwareFile
Is CVE-2026-9457 being exploited?
Not confirmed. CVE-2026-9457 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 2.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-9457?
CVE-2026-9457 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-2026-9457?
Not known from our data. No patch reference has been recorded for CVE-2026-9457, 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-2026-9457 affect?
CVE-2026-9457 affects Totolink A8000RU 7.1cu.643_b20200521 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-2026-9457?
Apply patch when released; restrict or disable remote Web mgmt access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on the device via manipulated FileName in UploadFirmwareFile; attacker can run arbitrary OS commands.
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.