CVE-2021-43661Public exploitNetwork attack vector

Client-side script execution via unsanitized SSID

Published Mar 30, 2022 · Updated Aug 4, 2024

Reflected XSS in TOTOLINK EX300_v2 firmware 4.0.3c.140_B20210429 allows remote attackers to execute scripts via a malicious SSID. The /home.asp page inserts an SSID value from wireless scan results into generated content without sanitization, so a browser interprets embedded markup as code. A victim must open the page while the crafted SSID is visible; execution occurs in the device interface's origin and is limited to browser-accessible data and actions.

CVSS severity6.1
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in TOTOLINK EX300_v2 firmware 4.0.3c.140_B20210429 allows remote attackers to execute scripts via a malicious SSID. The /home.asp page inserts an SSID value from wireless scan results into generated content without sanitization, so a browser interprets embedded markup as code. A victim must open the page while the crafted SSID is visible; execution occurs in the device interface's origin and is limited to browser-accessible data and actions.

The record

CVE
CVE-2021-43661
Published
Mar 30, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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