CVE-2026-38577
Hardcoded admin credentials in Tenda HG21 firmware enable root takeover.
Is CVE-2026-38577 being exploited?
Not confirmed. CVE-2026-38577 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-38577?
CVE-2026-38577 is rated Critical with a CVSS score of 9.8. 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-2026-38577?
Not known from our data. No patch reference has been recorded for CVE-2026-38577, 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-2026-38577 affect?
CVE-2026-38577 affects Tenda HG21 (firmware V4.0.0-260302). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-38577?
Isolate/replace affected routers; restrict admin access; apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Hardcoded admin creds allow remote root access, full device compromise, network pivot, and persistent backdoor.
Immediate action required