CVE-2021-29979

FAUCET Score

CVE-2021-29979 is a cross-site scripting (XSS) vulnerability affecting Mozilla Hubs Cloud versions prior to 1.0.1/20210618012634. This flaw allows attackers to execute arbitrary JavaScript within the Hubs Cloud instance's primary hosting domain by tricking users into downloading malicious HTML and JavaScript content. Rated Medium severity with a CVSS score of 6.1, it requires user interaction and has low 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

Vendor	Product	Version(s)	CPE
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:mozilla:hubs_cloud:-:::::::*

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

0.67%

Probability of exploitation in next 30 days

EPSS Percentile

48.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0067 is in the 53rd 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

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference

View patch

References

bugzilla.mozilla.org / show_bug.cgi

Permissions Required

mozilla.org / security/advisories/mfsa2021-32

Vendor Advisory