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CVE-2021-4124

22
FAUCET Score

CVE-2021-4124 describes a Cross-site Scripting (XSS) vulnerability in the janus-gateway product by Meetecho. This medium-severity flaw (CVSS 6.1) allows an unauthenticated attacker to inject malicious scripts into web pages, requiring user interaction, potentially leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.11.6CPE matchmatch criteria
cpe:2.3:a:meetecho:janus:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.94%
Probability of exploitation in next 30 days
EPSS Percentile
57.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0094 is in the 69th percentile among its peer group of 26,219 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

github.com / meetecho/janus-gateway/commit/f62bba6513ec840761f2434b93168106c7c65a3d
PatchThird Party Advisory
huntr.dev / bounties/a6ca142e-60aa-4d6f-b231-5d1bcd1b7190
ExploitPatchThird Party Advisory