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Wormable code-execution flaw in Cisco Jabber has a severity rating of 9.9 out of 10

Positivity     50%   
   Negativity   50%
The New York Times
SOURCE: https://arstechnica.com/information-technology/2020/12/wormable-zero-click-vulnerability-in-cisco-jabber-gets-patched-a-second-time/
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Summary

The company failed to adequately fix the vulnerability before, so it?s trying again.

As said here by Dan Goodin