Buffer overflow in Trendnet Tew-821dap
CVE-2026-77946
A vulnerability was determined in TRENDnet TEW-821DAP 2.2.01b05. Affected by this vulnerability is the function uci_safe_get of the file /cgi-bin/apply_time.cgi of the component NTP Timezone Configuration Handler. Executing a manipulation of the argument system.ntp.server/system.ntp.enable_server/cameo.time.time_zone/cameo.cameo.syslog_server can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.004
Affected products
- Trendnet Tew-821dap — versions 2.2.01b05
Weakness classification (CWE)
References
- github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/ma… (exploit)
- vuldb.com/cve/CVE-2026-77946 (third-party-advisory)
- vuldb.com/submit/881252 (third-party-advisory)
- vuldb.com/vuln/394175 (technical-description, vdb-entry)
- vuldb.com/vuln/394175/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-77946?
- CVE-2026-77946 is a critical-severity vulnerability in Trendnet Tew-821dap, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-08-22.
- How severe is CVE-2026-77946?
- Critical severity. CVSS v3 base score is 10.0 out of 10.