CVE-2021-42703

Name: CVE-2021-42703
Creator: NVD / NIST
Published: 2021-11-15T15:15:06.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2021-42703 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. This vulnerability could allow an attacker to send malicious Javascript code resulting in hijacking of the user’s cookie/session tokens, redirecting the user to a malicious webpage, and performing unintended browser action.. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

This vulnerability could allow an attacker to send malicious Javascript code resulting in hijacking of the user’s cookie/session tokens, redirecting the user to a malicious webpage, and performing unintended browser action.

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

0.60%

44.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Advantech	Webaccess Hmi Designer	< 2.1.11.0

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory, US Government Resource

Timeline

Published: Nov 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42703?

How severe is CVE-2021-42703?

CVE-2021-42703 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42703?

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-2021-42703?

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

Scan your code now

Source: NVD / NIST