CVE-2021-22676

Name: CVE-2021-22676
Creator: NVD / NIST
Published: 2021-08-10T15:15:07.457+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2021-22676 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. UserExcelOut.asp within WebAccess/SCADA is vulnerable to cross-site scripting (XSS), which could allow an attacker to send malicious JavaScript code. This could result in hijacking of cookie/session tokens, redirection to a malicious webpage, and unintended browser action on the WebAccess/SCADA (WebAccess/SCADA versions prior to 8.4.5, WebAccess/SCADA versions prior to 9.0.1).. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

UserExcelOut.asp within WebAccess/SCADA is vulnerable to cross-site scripting (XSS), which could allow an attacker to send malicious JavaScript code. This could result in hijacking of cookie/session tokens, redirection to a malicious webpage, and unintended browser action on the WebAccess/SCADA (WebAccess/SCADA versions prior to 8.4.5, WebAccess/SCADA versions prior to 9.0.1).

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

0.64%

46.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Advantech	Webaccess\/Scada	< 8.4.5
Advantech	Webaccess\/Scada	>= 9.0, < 9.0.1

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-217-04Third Party Advisory, US Government Resource

Timeline

Published: Aug 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22676?

How severe is CVE-2021-22676?

CVE-2021-22676 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22676?

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-2021-22676?

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

Scan your code now

Source: NVD / NIST