What is CVE-2021-42872?

CVE-2021-42872 is a critical-severity vulnerability in Totolink Ex1200t, classified under OS Command Injection. CVSS score: 9.8/10. Published 2022-06-02.

How severe is CVE-2021-42872?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-42872 known to be exploited?

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

RCE in Totolink Ex1200t

CVE-2021-42872

TOTOLINK EX1200T V4.1.2cu.5215 is affected by a command injection vulnerability that can remotely execute arbitrary code.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.066 (93.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.066 · newest: 0.066 · change: 0.000

Affected products

Totolink Ex1200t
Totolink Ex1200t Firmware — versions 4.1.2cu.5215

Weakness classification (CWE)

CWE-78 — OS Command Injection

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_NoticeUrl_rce4.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42872?: CVE-2021-42872 is a critical-severity vulnerability in Totolink Ex1200t, classified under OS Command Injection. CVSS score: 9.8/10. Published 2022-06-02.
How severe is CVE-2021-42872?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-42872 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.