Is CVE-2019-3570 actively exploited?

No active exploitation of CVE-2019-3570 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-3570 be exploited remotely?

Yes. CVE-2019-3570 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-3570?

CVE-2019-3570 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2019-3570

CWE-122Published: July 18, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Call to the scrypt_enc() function in HHVM can lead to heap corruption by using specifically crafted parameters (N, r and p). This happens if the parameters are configurable by an attacker for instance by providing the output of scrypt_enc() in a context where Hack/PHP code would attempt to verify it by re-running scrypt_enc() with the same parameters. This could result in information disclosure, memory being overwriten or crashes of the HHVM process. This issue affects versions 4.3.0, 4.4.0, 4.5.0, 4.6.0, 4.7.0, 4.8.0, versions 3.30.5 and below, and all versions in the 4.0, 4.1, and 4.2 series.

NVD Source

Technical Analysis

CVE-2019-3570 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.