What is CVE-2020-14078?

CVE-2020-14078 is a high-severity vulnerability in Trendnet Tew-827dru, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-06-15.

How severe is CVE-2020-14078?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Trendnet Tew-827dru

CVE-2020-14078

TRENDnet TEW-827DRU devices through 2.06B04 contain a stack-based buffer overflow in the ssi binary. The overflow allows an authenticated user to execute arbitrary code by POSTing to apply.cgi via the action wifi_captive_portal_login with a sufficiently long REMOTE_ADDR key.

Vulnerability class: Buffer Overflow

Published 2020-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.5th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/kuc001/IoTFirmware/blob/master/Trendnet/TEW-827/wifi_captive_portal_… (Third Party Advisory)
github.com/kuc001/IoTFirmware/blob/master/Trendnet/TEW-827/TRENDnet-wifi_captiv… (Third Party Advisory)

Frequently asked questions

What is CVE-2020-14078?: CVE-2020-14078 is a high-severity vulnerability in Trendnet Tew-827dru, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-06-15.
How severe is CVE-2020-14078?: High severity. CVSS v3 base score is 8.8 out of 10.