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CVE-2020-21316

20
FAUCET Score

CVE-2020-21316 describes a Cross-site Scripting (XSS) vulnerability in the comment section of ZrLog version 2.1.3. This flaw allows remote attackers to inject malicious web scripts through the nickname parameter, potentially leading to the theft of administrator cookies and unauthorized access to the admin panel. Rated as MEDIUM severity with a CVSS score of 6.1, the vulnerability requires user interaction (UI:R) but can be exploited over the network (AV:N) with low attack complexity (AC:L), impacting confidentiality and integrity (C:L/I:L). There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB, and the vulnerability has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.3CPE matchmatch criteria
cpe:2.3:a:zrlog:zrlog:2.1.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 75th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

gist.github.com / T-pod/d9405dbd61243990d65d55c5df0fcbe6
PatchThird Party Advisory
github.com / 94fzb/zrlog/commit/b921c1ae03b8290f438657803eee05226755c941
PatchThird Party Advisory
github.com / 94fzb/zrlog/issues/56
PatchThird Party Advisory