CVE-2021-20855Network attack vector

Authenticated browser script execution via undisclosed input handling

Published Dec 1, 2021 · Updated Aug 3, 2024

Cross-site scripting in ELECOM WRH-733GBK and WRH-733GWH firmware 1.02.9 and earlier allows remote authenticated users to run scripts. Public advisories do not identify the affected WebUI field or the input-handling operation that fails to neutralize attacker-controlled content. Exploitation requires authenticated access and user interaction, and successful injection executes arbitrary script in a user's logged-in browser context.

CVSS severity5.4
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in ELECOM WRH-733GBK and WRH-733GWH firmware 1.02.9 and earlier allows remote authenticated users to run scripts. Public advisories do not identify the affected WebUI field or the input-handling operation that fails to neutralize attacker-controlled content. Exploitation requires authenticated access and user interaction, and successful injection executes arbitrary script in a user's logged-in browser context.

The record

CVE
CVE-2021-20855
Published
Dec 1, 2021
Updated
Aug 3, 2024
Vendor
ELECOM CO., LTD.
Product
ELECOM LAN Routers
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ELECOM CO., LTD. · ELECOM LAN Routersversion=WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior

Published CVSS scores

3.5JPCERT/CC and IPAAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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