CVE-2020-21493

Name: CVE-2020-21493
Creator: NVD / NIST
Published: 2021-10-04T21:15:12.347+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2020-21493 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. An issue in the component route\user.php of Xiuno BBS v4.0.4 allows attackers to enumerate usernames.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

An issue in the component route\user.php of Xiuno BBS v4.0.4 allows attackers to enumerate usernames.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.97%

57.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Xiuno	Xiunobbs	4.0.4

References

https://gitee.com/xiuno/xiunobbs/issues/I1690WIssue Tracking, Third Party Advisory
https://github.com/wanghaiwei/xiuno-docker/issues/3Exploit, Issue Tracking, Third Party Advisory
https://gitee.com/xiuno/xiunobbs/issues/I1690WIssue Tracking, Third Party Advisory
https://github.com/wanghaiwei/xiuno-docker/issues/3Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Oct 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21493?

An issue in the component route\user.php of Xiuno BBS v4.0.4 allows attackers to enumerate usernames.

How severe is CVE-2020-21493?

CVE-2020-21493 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21493?

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-2020-21493?

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

Scan your code now

Source: NVD / NIST