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CVE-2021-34424

25
FAUCET Score

CVE-2021-34424 is a memory exposure vulnerability affecting numerous Zoom products across various platforms, including Zoom Client for Meetings, Zoom Rooms, Zoom VDI clients, and several Zoom SDKs and on-premise connectors. This flaw could allow an attacker to gain insight into arbitrary areas of the product's memory. With a CVSS score of 7.5 (High), it is a network-exploitable vulnerability requiring no user interaction, potentially leading to high confidentiality impact. While the vulnerability has garnered some community discussion and media coverage, there is currently no evidence of active exploitation, nor are there publicly available exploit codes in Metasploit, Nuclei, or ExploitDB.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.8.3CPE matchmatch criteria
cpe:2.3:a:zoom:meetings:*:*:*:*:*:*:*:*
< 5.8.4CPE matchmatch criteria
cpe:2.3:a:zoom:meetings:*:*:*:*:*:*:*:*
< 5.8.1CPE matchmatch criteria
cpe:2.3:a:zoom:meetings_for_blackberry:*:*:*:*:*:*:*:*
< 5.8.4CPE matchmatch criteria
cpe:2.3:a:zoom:meetings_for_intune:*:*:*:*:*:*:*:*
< 5.0.1CPE matchmatch criteria
cpe:2.3:a:zoom:meetings_for_chrome_os:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.67%
Probability of exploitation in next 30 days
EPSS Percentile
74.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0167 is in the 57th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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

packetstormsecurity.com / files/165419/Zoom-MMR-Server-Information-Leak.html
Third Party AdvisoryVDB Entry
explore.zoom.us / en/trust/security/security-bulletin
Vendor Advisory