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Date: October 26, 2021

HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.

Language: C++

Severity Score

Severity Score

Weakness Type (CWE)

Path Traversal


Top Fix


Upgrade Version

Upgrade to version HHVM-4.56.2, 4.78.0, 4.79.1, 4.80.1, 4.81.1, 4.82.1, 4.83.1, 4.84.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): HIGH


Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): PARTIAL
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