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CVE Record

CVE-2019-13449: In the Zoom Client before 4.4.2 on macOS, remote attackers can cause a denial of service (continual focus g...

In the Zoom Client before 4.4.2 on macOS, remote attackers can cause a denial of service (continual focus grabs) via a sequence of invalid launch?action=join&confno= requests to localhost port 19421.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE affects older Zoom Client versions on macOS. A remote attacker could cause repeated focus-stealing behavior by sending malformed Zoom join requests to a local Zoom service. The impact is denial of service and user disruption, not documented data theft or code execution in this CVE.

Executive priority

Handle through endpoint hygiene rather than emergency response. The business risk is user disruption and exposure from outdated conferencing software. Prioritize cleanup if legacy macOS Zoom clients still exist.

Technical view

Zoom Client before 4.4.2 on macOS exposed localhost port 19421 behavior that could be abused with repeated invalid launch?action=join&confno= requests. The CVE describes continual focus grabs causing denial of service. No CVSS, CWE, or active exploitation evidence is provided in the source bundle.

Likely exposure

Exposure is most likely on macOS endpoints still running Zoom Client before 4.4.2. Modern managed fleets should have low exposure if Zoom updates are enforced and legacy clients have been removed.

Exploitation context

The issue was publicly documented in July 2019 and discussed by Zoom and the researcher. The bundle does not show CISA KEV listing or other evidence of active exploitation. Treat exploitability as public knowledge, but active exploitation as unproven here.

Researcher notes

The CVE scope is narrower than the broader 2019 Zoom webcam discussion. For this record, stay focused on the localhost port 19421 denial-of-service behavior and version boundary. Source data is incomplete for scoring and confirmed exploitation.

Mitigation direction

  • Inventory macOS endpoints for Zoom Client versions before 4.4.2.
  • Upgrade Zoom Client on macOS to 4.4.2 or later.
  • Remove unsupported or unmanaged legacy Zoom installations.
  • Review Zoom vendor guidance before applying compensating controls.
  • Prioritize managed update enforcement for conferencing clients.

Validation and detection

  • Confirm no macOS endpoint reports Zoom Client before 4.4.2.
  • Check software inventory for unmanaged Zoom installations.
  • Review endpoint telemetry for repeated Zoom localhost launch activity.
  • Validate browser and endpoint policies after Zoom remediation.
  • Document exception owners for any remaining legacy clients.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-13449 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.