What is CVE-2020-21493?

CVE-2020-21493 is a medium-severity vulnerability in Xiuno Xiunobbs. CVSS score: 5.3/10. Published 2021-10-04.

How severe is CVE-2020-21493?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Xiuno Xiunobbs

CVE-2020-21493

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

Published 2021-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Xiuno Xiunobbs — versions 4.0.4

References

github.com/wanghaiwei/xiuno-docker/issues/3 (Exploit, Third Party Advisory, Issue Tracking)
gitee.com/xiuno/xiunobbs/issues/I1690W (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21493?: CVE-2020-21493 is a medium-severity vulnerability in Xiuno Xiunobbs. CVSS score: 5.3/10. Published 2021-10-04.
How severe is CVE-2020-21493?: Medium severity. CVSS v3 base score is 5.3 out of 10.