CVE-2026-77946
Remote stack buffer overflow in TRENDnet TEW-821DAP web CGI allowing full device takeover.
Is CVE-2026-77946 being exploited?
Not confirmed. CVE-2026-77946 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 0.62% probability of exploitation in the next 30 days.
How severe is CVE-2026-77946?
CVE-2026-77946 is rated Critical with a CVSS score of 9.3. 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-2026-77946?
Not known from our data. No patch reference has been recorded for CVE-2026-77946, 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-2026-77946 affect?
CVE-2026-77946 affects TRENDnet TEW-821DAP (firmware 2.2.01b05), /cgi-bin/apply_time.cgi uci_safe_get, Embedded routers running affected firmware. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77946?
Isolate affected devices, disable remote admin, block access, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution and full device takeover via stack-based buffer overflow in router web interface; network pivot and persistence possible.
Immediate action required
- affected2.2.01b05
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.