HOMEVULNERABILITIESCVE-2020-5634
HIGH

CVE-2020-5634

NVD-CWE-noinfoPublished: October 6, 2020· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

ELECOM LAN routers (WRC-2533GST2 firmware versions prior to v1.14, WRC-1900GST2 firmware versions prior to v1.14, WRC-1750GST2 firmware versions prior to v1.14, and WRC-1167GST2 firmware versions prior to v1.10) allow an attacker on the same network segment to execute arbitrary OS commands with a root privilege via unspecified vectors.

NVD Source

Technical Analysis

CVE-2020-5634 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

elecom8 product(s)
wrc-2533gst2 firmwarewrc-2533gst2wrc-1900gst2 firmwarewrc-1900gst2wrc-1750gst2 firmwarewrc-1750gst2wrc-1167gst2 firmwarewrc-1167gst2
Source: NVD CPE · 8 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/JVN82892096/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20201005-01/
ADVISORYhttps://jvn.jp/en/jp/JVN82892096/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20201005-01/

All References (4)

→
https://jvn.jp/en/jp/JVN82892096/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20201005-01/Vendor Advisory
→
https://jvn.jp/en/jp/JVN82892096/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20201005-01/Vendor Advisory

Quick Facts

CVE IDCVE-2020-5634
CVSS Score8.8 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedOct 6, 2020

Related CVEs (NVD-CWE-noinfo)

CVE-2009-2543
10.0
CVE-2008-6546
10.0
CVE-2022-21390
10.0
CVE-2022-21389
10.0
CVE-2022-21275
10.0
CVE-2008-6566
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5634 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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