CVE-2021-34425Network attack vector

Arbitrary HTTP GET requests via crafted link previews

Published Dec 14, 2021 · Updated Sep 17, 2024

Server-side request forgery in Zoom Client for Meetings before 5.7.3 allows remote attackers to issue arbitrary HTTP GET requests. The chat link-preview handler requests attacker-supplied URLs from the recipient's device without restricting destinations unreachable to the attacker. A recipient must enable link previews and receive attacker-controlled chat content; the published impact is limited to GET-based access.

CVSS severity4.7
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Zoom Client for Meetings before 5.7.3 allows remote attackers to issue arbitrary HTTP GET requests. The chat link-preview handler requests attacker-supplied URLs from the recipient's device without restricting destinations unreachable to the attacker. A recipient must enable link previews and receive attacker-controlled chat content; the published impact is limited to GET-based access.

The record

CVE
CVE-2021-34425
Published
Dec 14, 2021
Updated
Sep 17, 2024
Vendor
Zoom Video Communications, Inc.
Product
Zoom Client for Meetings for Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <5.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zoom Video Communications, Inc. · Zoom Client for Meetings for Linuxversion=unspecified <5.7.3
Zoom Video Communications, Inc. · Zoom Client for Meetings for Androidversion=unspecified <5.7.3
Zoom Video Communications, Inc. · Zoom Client for Meetings for Windowsversion=unspecified <5.7.3
Zoom Video Communications, Inc. · Zoom Client for Meetings for MacOSversion=unspecified <5.7.3
Zoom Video Communications, Inc. · Zoom Client for Meetings for iOSversion=unspecified <5.7.3

Published CVSS scores

4.7Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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