CVE-2021-36603

Name: CVE-2021-36603
Creator: NVD / NIST
Published: 2023-01-09T21:15:10.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-36603 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scripting (XSS) in Tasmota firmware 6.5.0 allows remote attackers to inject JavaScript code via a crafted string in the field "Friendly Name 1".. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) in Tasmota firmware 6.5.0 allows remote attackers to inject JavaScript code via a crafted string in the field "Friendly Name 1".

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.54%

41.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tasmota Project	Tasmota	6.5.0

References

https://github.com/arendst/Tasmota/issues/12221Exploit, Issue Tracking, Third Party Advisory
https://github.com/arendst/Tasmota/issues/12221Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Jan 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36603?

Cross Site Scripting (XSS) in Tasmota firmware 6.5.0 allows remote attackers to inject JavaScript code via a crafted string in the field "Friendly Name 1".

How severe is CVE-2021-36603?

CVE-2021-36603 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36603?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36603?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST