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Vulnerability record · CVE-2021-43661 · published 31 March 2022

CVE-2021-43661: Totolink ex300 v2 firmware cross-site scripting vulnerability

TTotolink · Ex300 V2 Firmware

totolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the component /home.asp.

6.1 CVSS 3.1 Medium EPSS 0.64% · top 51.4% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

totolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the component /home.asp.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/chibataiki/iot-vuls/blob/main/totolink/xss-vulnerability.md ExploitThird Party Advisory
https://github.com/chibataiki/iot-vuls/blob/main/totolink/xss-vulnerability.md ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-32449Totolink ex300 v2 firmware command injection vulnerabilityTOTOLINK EX300_V2 V4.0.3c.7484 was discovered to contain a command injection vulnerability via the langType parameter in the setLanguageCfg function.…EPSS 19%8.8CVE-2022-25008Totolink ex300 v2 firmware missing authentication for critical function vulnerabilitytotolink EX300_v2 V4.0.3c.140_B20210429 and EX1200T V4.1.2cu.5230_B20210706 does not contain an authentication mechanism.EPSS 4.4%8.1CVE-2021-43664Totolink ex300 v2 firmware command injection vulnerabilitytotolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a command injection vulnerability via the component process forceugpo.EPSS 1.7%7.5CVE-2021-43663Totolink ex300 v2 firmware command injection vulnerabilitytotolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a command injection vulnerability via the component cloudupdate_check.EPSS 0.96%6.5CVE-2021-43662Totolink ex300 v2 firmware allocation without limits vulnerabilitytotolink EX300_v2, ver V4.0.3c.140_B20210429 and A720R ,ver V4.1.5cu.470_B20200911 have an issue which causes uncontrolled resource consumption.EPSS 0.55%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed

Source: NIST National Vulnerability Database (record CVE-2021-43661), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.