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CVE-2021-4020

20
FAUCET Score

CVE-2021-4020 describes a Cross-site Scripting (XSS) vulnerability in janus-gateway, affecting meetecho janus products. This medium-severity flaw (CVSS 5.4) allows an attacker to inject malicious scripts into web pages, potentially leading to information disclosure or defacement, requiring user interaction and network access for exploitation. Despite its potential impact, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.11.5CPE matchmatch criteria
cpe:2.3:a:meetecho:janus:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.82%
Probability of exploitation in next 30 days
EPSS Percentile
53.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0082 is in the 88th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 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 0.0 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

github.com / meetecho/janus-gateway/commit/d3fc00ec803d6c41d8f98908732f44e7f4911a1c
PatchThird Party Advisory
huntr.dev / bounties/9814baa8-7bdd-4e31-a132-d9d15653409e
ExploitIssue TrackingPatchThird Party Advisory