CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCVE-2021-34823
Critical (9.1) in on24 screenshare. EPSS 2.0% chance of exploitation in the next 30 days.
The ON24 ScreenShare (aka DesktopScreenShare.app) plugin before 2.0 for macOS allows remote file access via its built-in HTTP server. This allows unauthenticated remote users to retrieve files accessible to the logged-on macOS user. When a remote user sends a crafted HTTP request to the server, it triggers a code path that will download a configuration file from a specified remote machine over HTTP. There is an XXE flaw in processing of this configuration file that allows reading local (to macOS) files and uploading them to remote machines.
Severity
- EPSS
- 2.0% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)
- CWE
- CWE-611
- Published
- Modified
- Record from
- the NVD, synced
Affected
- on24:screenshare
References
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=29105
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=29105