What is CVE-2020-21316?

CVE-2020-21316 is a medium-severity vulnerability in Zrlog, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-15.

How severe is CVE-2020-21316?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Zrlog

CVE-2020-21316

A Cross-site scripting (XSS) vulnerability exists in the comment section in ZrLog 2.1.3, which allows remote attackers to inject arbitrary web script and stolen administrator cookies via the nickname parameter and gain access to the admin panel.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Zrlog — versions 2.1.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/94fzb/zrlog/issues/56 (Patch, Third Party Advisory)
gist.github.com/T-pod/d9405dbd61243990d65d55c5df0fcbe6 (Patch, Third Party Advisory)
github.com/94fzb/zrlog/commit/b921c1ae03b8290f438657803eee05226755c941 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-21316?: CVE-2020-21316 is a medium-severity vulnerability in Zrlog, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-15.
How severe is CVE-2020-21316?: Medium severity. CVSS v3 base score is 6.1 out of 10.