HOMEVULNERABILITIESCVE-2022-21173
HIGH

CVE-2022-21173

NVD-CWE-OtherPublished: February 8, 2022· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Hidden functionality vulnerability in ELECOM LAN routers (WRH-300BK3 firmware v1.05 and earlier, WRH-300WH3 firmware v1.05 and earlier, WRH-300BK3-S firmware v1.05 and earlier, WRH-300DR3-S firmware v1.05 and earlier, WRH-300LB3-S firmware v1.05 and earlier, WRH-300PN3-S firmware v1.05 and earlier, WRH-300WH3-S firmware v1.05 and earlier, and WRH-300YG3-S firmware v1.05 and earlier) allows an attacker on the adjacent network to execute an arbitrary OS command via unspecified vectors.

NVD Source

Technical Analysis

CVE-2022-21173 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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 8.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

elecom16 product(s)
wrh-300bk3 firmwarewrh-300bk3wrh-300wh3 firmwarewrh-300wh3wrh-300bk3-s firmwarewrh-300bk3-swrh-300wh3-s firmwarewrh-300wh3-swrh-300lb3-s firmwarewrh-300lb3-swrh-300pn3-s firmwarewrh-300pn3-s+4
Source: NVD CPE · 16 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

ADVISORYhttps://jvn.jp/en/jp/JVN17482543/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20220208-02/
ADVISORYhttps://jvn.jp/en/jp/JVN17482543/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20220208-02/

All References (4)

→
https://jvn.jp/en/jp/JVN17482543/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20220208-02/Vendor Advisory
→
https://jvn.jp/en/jp/JVN17482543/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20220208-02/Vendor Advisory

Quick Facts

CVE IDCVE-2022-21173
CVSS Score8.8 / 10
SeverityHIGH
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 8, 2022

Related CVEs (NVD-CWE-Other)

CVE-2002-0436
10.0
CVE-2004-1770
10.0
CVE-2001-0247
10.0
CVE-2003-0201
10.0
CVE-2008-1256
10.0
CVE-2011-0385
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-21173 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.
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