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CVE-2021-30480

30
FAUCET Score

CVE-2021-30480 is a critical vulnerability in Zoom Chat for Windows and macOS, allowing remote authenticated attackers within the same organization or accepted contacts to execute arbitrary code without user interaction. This vulnerability, distinct from Zoom Meetings chat, carries a high CVSS score of 8.8, indicating severe potential impact including full compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, and community discussion is minimal, its high FAUCET Risk Score and EPSS percentile suggest a significant underlying threat.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2021-04-09CPE matchmatch criteria
cpe:2.3:a:zoom:chat:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.84%
Probability of exploitation in next 30 days
EPSS Percentile
92.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0584 is in the 92nd percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 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

Remediation records are not available for this CVE.

References

blog.malwarebytes.com / exploits-and-vulnerabilities/2021/04/zoom-zero-day-discovery-makes-calls-safer-hackers-200000-richer
Third Party Advisory
explore.zoom.us / en/trust/security/security-bulletin
Vendor Advisory
sector7.computest.nl / post/2021-08-zoom
ExploitThird Party Advisory
twitter.com / thezdi/status/1379855435730149378
Third Party Advisory
twitter.com / thezdi/status/1379859851061395459
Third Party Advisory
securityweek.com / 200000-awarded-zero-click-zoom-exploit-pwn2own
Press/Media CoverageThird Party Advisory
zdnet.com / article/critical-zoom-vulnerability-triggers-remote-code-execution-without-user-input
Press/Media CoverageThird Party Advisory
zerodayinitiative.com / advisories/ZDI-21-971
Third Party AdvisoryVDB Entry
zoom.us / feature/messaging
ProductVendor Advisory