CVE-2026-4254
Remote buffer overflow in Tenda AC8 router allows code execution
Is CVE-2026-4254 being exploited?
Not confirmed. CVE-2026-4254 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 0.89% probability of exploitation in the next 30 days.
How severe is CVE-2026-4254?
CVE-2026-4254 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-2026-4254?
Not known from our data. No patch reference has been recorded for CVE-2026-4254, 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-2026-4254 affect?
CVE-2026-4254 affects Tenda AC8 router (firmware <= 16.03.50.11). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-4254?
Update firmware when available; disable remote management; enforce firewall.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remotely trigger stack overflow via doSystemCmd arg, enabling code execution on the router
Immediate action required
- affected16.03.50.0
- affected16.03.50.1
- affected16.03.50.2
- affected16.03.50.3
- affected16.03.50.4
- affected16.03.50.5
- affected16.03.50.6
- affected16.03.50.7
- affected16.03.50.8
- affected16.03.50.9
- affected16.03.50.10
- affected16.03.50.11
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.