What is CVE-2021-42892?

CVE-2021-42892 is a medium-severity vulnerability in Totolink Ex1200t, classified under Use of Hard-coded Credentials. CVSS score: 4.3/10. Published 2022-06-03.

How severe is CVE-2021-42892?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Totolink Ex1200t

CVE-2021-42892

In TOTOLINK EX1200T V4.1.2cu.5215, an attacker can start telnet without authorization because the default username and password exists in the firmware.

Published 2022-06-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Totolink Ex1200t
Totolink Ex1200t Firmware — versions 4.1.2cu.5215

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

github.com/p1Kk/vuln/blob/main/totolink_ex1200t_telnet_default.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42892?: CVE-2021-42892 is a medium-severity vulnerability in Totolink Ex1200t, classified under Use of Hard-coded Credentials. CVSS score: 4.3/10. Published 2022-06-03.
How severe is CVE-2021-42892?: Medium severity. CVSS v3 base score is 4.3 out of 10.