HOMEVULNERABILITIESCVE-2021-42875
CRITICAL

CVE-2021-42875

CWE-78Published: June 2, 2022· Updated: Jul 9, 2026

9.8
CVSS v3.1

Official Description

TOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in the function setDiagnosisCfg of the file lib/cste_modules/system.so to control the ipDoamin.

NVD Source

Technical Analysis

CVE-2021-42875 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

totolink2 product(s)
ex1200t firmwareex1200t
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://totolink.net
ADVISORYhttps://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.md
ADVISORYhttp://totolink.net
ADVISORYhttps://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.md

All References (4)

→
http://totolink.netVendor Advisory
→
https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.mdExploit · Third Party Advisory
→
http://totolink.netVendor Advisory
→
https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.mdExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42875
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-78
CISA KEVNo
Affected1 vendor(s)
PublishedJun 2, 2022

Related CVEs (CWE-78)

CVE-2019-5485
10.0
CVE-1999-0067
10.0
CVE-2016-10043
10.0
CVE-2017-14459
10.0
CVE-2023-3572
10.0
CVE-2026-34234
KEV10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42875 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-42875·NVD