Vulnerability Details : CVE-2021-28133
Zoom through 5.5.4 sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. When a user shares a specific application window via the Share Screen functionality, other meeting participants can briefly see contents of other application windows that were explicitly not shared. The contents of these other windows can (for instance) be seen for a short period of time when they overlay the shared window and get into focus. (An attacker can, of course, use a separate screen-recorder application, unsupported by Zoom, to save all such contents for later replays and analysis.) Depending on the unintentionally shared data, this short exposure of screen contents may be a more or less severe security issue.
Vulnerability category: Information leak
Products affected by CVE-2021-28133
- cpe:2.3:a:zoom:zoom:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-28133
0.36%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-28133
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
2.8
|
1.4
|
NIST |
CWE ids for CVE-2021-28133
-
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-28133
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https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharing-funktionalitaet-von-zoom-cve-2021-28133
SYSS-2020-044: Sicherheitsproblem in Screen Sharing-Funktionalität von ZoomThird Party Advisory
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https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.html
New Zoom Screen-Sharing Bug Lets Other Users Access Restricted AppsThird Party Advisory
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https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.txt
Third Party Advisory
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http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.0301-Information-Disclosure.html
Zoom 5.4.3 (54779.1115) / 5.5.4 (13142.0301) Information Disclosure ≈ Packet StormThird Party Advisory
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http://seclists.org/fulldisclosure/2021/Mar/48
Full Disclosure: [SYSS-2020-044]: Zoom - Exposure of Resource to Wrong Sphere (CWE-668) (CVE-2021-28133)Third Party Advisory
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https://zoom.us/trust/security/security-bulletin
Security BulletinVendor Advisory
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https://www.youtube.com/watch?v=SonmmgQlLzg
Zoom Unintended Screen Sharing Issue (CVE-2021-28133) - YouTubeThird Party Advisory
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