What is CVE-2021-42877?

CVE-2021-42877 is a high-severity vulnerability in Totolink Ex1200t. CVSS score: 7.5/10. Published 2022-06-02.

How severe is CVE-2021-42877?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-42877 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Totolink Ex1200t

CVE-2021-42877

TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in function RebootSystem of the file lib/cste_modules/system which can reboot the system.

Published 2022-06-02 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Totolink Ex1200t
Totolink Ex1200t Firmware — versions 4.1.2cu.5215

Public proof-of-concept exploits

References

totolink.net/ (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (URL Repurposed, Broken Link)
github.com/p1Kk/vuln/blob/main/totolink_ex1200t_reboot.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42877?: CVE-2021-42877 is a high-severity vulnerability in Totolink Ex1200t. CVSS score: 7.5/10. Published 2022-06-02.
How severe is CVE-2021-42877?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-42877 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.