HOMEVULNERABILITIESCVE-2021-20636
MEDIUM

CVE-2021-20636

CWE-352Published: February 12, 2021· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

Cross-site request forgery (CSRF) vulnerability in LOGITEC LAN-W300N/PR5B allows remote attackers to hijack the authentication of administrators via a specially crafted URL. As a result, unintended operations to the device such as changes of the device settings may be conducted.

NVD Source

Technical Analysis

CVE-2021-20636 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

logitech2 product(s)
lan-w300n\/pr5b firmwarelan-w300n\/pr5b
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

ADVISORYhttps://jvn.jp/en/jp/JVN96783542/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20210126-01/
ADVISORYhttps://jvn.jp/en/jp/JVN96783542/index.html
ADVISORYhttps://www.elecom.co.jp/news/security/20210126-01/

All References (4)

→
https://jvn.jp/en/jp/JVN96783542/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20210126-01/Vendor Advisory
→
https://jvn.jp/en/jp/JVN96783542/index.htmlThird Party Advisory
→
https://www.elecom.co.jp/news/security/20210126-01/Vendor Advisory

Quick Facts

CVE IDCVE-2021-20636
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-352
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 12, 2021

Related CVEs (CWE-352)

CVE-2025-32642
10.0
CVE-2025-23922
10.0
CVE-2017-5145
10.0
CVE-2024-47359
9.8
CVE-2017-6080
9.8
CVE-2024-29684
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20636 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.COM. CVE data is provided under the NVD usage policy.
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