CVE-2020-21639

Name: CVE-2020-21639
Creator: NVD / NIST
Published: 2021-11-16T19:15:07.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2020-21639 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Ruijie RG-UAC 6000-E50 commit 9071227 was discovered to contain a cross-site scripting (XSS) vulnerability via the rule_name parameter. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

Ruijie RG-UAC 6000-E50 commit 9071227 was discovered to contain a cross-site scripting (XSS) vulnerability via the rule_name parameter. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

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

0.56%

42.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Ruijie	Rg-Uac 6000-E50 Firmware	All versions

References

https://github.com/Sm1L3ing/ACSEC/blob/master/Ruijie-RG-UACThird Party Advisory
https://github.com/Sm1L3ing/ACSEC/blob/master/Ruijie-RG-UACThird Party Advisory

Timeline

Published: Nov 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21639?

How severe is CVE-2020-21639?

CVE-2020-21639 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21639?

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-2020-21639?

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

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Source: NVD / NIST