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Fencer Intel
medium 4.7

CVE-2021-34425 json

Server Side Request Forgery in Zoom Client for Meetings chat

published 4y ago modified 4mo ago also EUVD-2021-21083

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

The Zoom Client for Meetings before version 5.7.3 (for Android, iOS, Linux, macOS, and Windows) contain a server side request forgery vulnerability in the chat\'s "link preview" functionality. In versions prior to 5.7.3, if a user were to enable the chat\'s "link preview" feature, a malicious actor could trick the user into potentially sending arbitrary HTTP GET requests to URLs that the actor cannot reach directly.

Patch / fix

  • Zoom Video Communications Inc Zoom Client for Meetings for Android 5.7.3
  • Zoom Video Communications Inc Zoom Client for Meetings for iOS 5.7.3
  • Zoom Video Communications Inc Zoom Client for Meetings for Linux 5.7.3
  • Zoom Video Communications Inc Zoom Client for Meetings for macOS 5.7.3
  • Zoom Video Communications Inc Zoom Client for Meetings for Windows 5.7.3

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Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N

Affected products

  • Zoom Video Communications Inc Zoom Client for Meetings for Android
  • Zoom Video Communications Inc Zoom Client for Meetings for iOS
  • Zoom Video Communications Inc Zoom Client for Meetings for Linux
  • Zoom Video Communications Inc Zoom Client for Meetings for macOS
  • Zoom Video Communications Inc Zoom Client for Meetings for Windows

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.