CVE-2021-20636Network attack vector

Administrative setting changes via forged web requests

Published Feb 12, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Logitec Corporation LAN-W300N/PR5B allows remote attackers to alter router settings via crafted URLs. The vendor identifies the administrative web page as the locus but does not disclose which request handler accepts state-changing requests without CSRF validation. An administrator must be logged in and open the crafted URL; successful exploitation can modify device settings.

CVSS severity4.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Logitec Corporation LAN-W300N/PR5B allows remote attackers to alter router settings via crafted URLs. The vendor identifies the administrative web page as the locus but does not disclose which request handler accepts state-changing requests without CSRF validation. An administrator must be logged in and open the crafted URL; successful exploitation can modify device settings.

The record

CVE
CVE-2021-20636
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
Logitec Corporation
Product
LAN-W300N/PR5B
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=LAN-W300N/PR5B

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Logitec Corporation · LAN-W300N/PR5Bversion=LAN-W300N/PR5B

Published CVSS scores

4.0JPCERT/CC and IPA JVNAV:N/AC:H/Au:N/C:P/I:P/A:N
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/A:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.3JPCERT/CC and IPA JVNCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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