CVE-2019-13449 — In the Zoom Client before 4

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-07-09T05:48:41.000Z
• Last modified: 2024-08-04T23:49:25.032Z

09References

• medium.com — https://medium.com/%40jonathan.leitschuh/zoom-zero-day-4-million-webcams-maybe-a…
• assets.zoom.us — https://assets.zoom.us/docs/pdf/Zoom+Response+Video-On+Vulnerability.pdf
• blog.zoom.us — https://blog.zoom.us/wordpress/2019/07/08/response-to-video-on-concern/
• twitter.com — https://twitter.com/zoom_us/status/1148710712241295361
• bugs.chromium.org — https://bugs.chromium.org/p/chromium/issues/detail?id=951540