Facebook last month patched a critical denial-of-service vulnerability in Fizz, its open-source implementation for Transport Layer Security protocol TLS 1.3, researchers have reported.

Unauthenticated remote attackers could exploit the flaw to create an "infinite loop," causing the web service to be unavailable for other users and thus disrupting service, according to a March 19 blog post from Semmle, whose researcher Kevin Backhouse uncovered the issue.

And because Facebook made Fizz's source code available for public use last August, other web services can potentially be attacked this way as well if they fail to apply secure updates.

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