Buffer Overflow Vulnerability in HHVM by Facebook

CVE-2020-1921

What is CVE-2020-1921?

A vulnerability exists in the crypt function of HHVM, where the code attempts to null terminate a buffer using the size of the input salt. This process does not adequately validate that the offset remains within the bounds of the buffer, potentially leading to a buffer overflow scenario. This flaw impacts several versions of HHVM, necessitating swift action from users to update and mitigate risk.

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