The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-4976 advisory.

  - A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and     iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code     execution. Apple is aware of a report that this issue may have been actively exploited. (CVE-2021-30858)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Debian DSA-4976-1 : wpewebkit - security update

high Nessus Plugin ID 153570

Version 1.7