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Vulnerability record · CVE-2020-1916 · published 10 March 2021

CVE-2020-1916: Facebook hhvm heap-based buffer overflow vulnerability

Facebook · Hhvm

An incorrect size calculation in ldap_escape may lead to an integer overflow when overly long input is passed in, resulting in an out-of-bounds write. This issue affects HHVM prior to 4.56.2, all versions between 4.57.0 and 4.78.0, 4.79.0, 4.80.0, 4.81.0, 4.82.0, 4.83.0.

9.8 CVSS 3.1 Critical EPSS 1.4% · top 28.9% CWE-122 · Heap-based buffer overflowCWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An incorrect size calculation in ldap_escape may lead to an integer overflow when overly long input is passed in, resulting in an out-of-bounds write. This issue affects HHVM prior to 4.56.2, all versions between 4.57.0 and 4.78.0, 4.79.0, 4.80.0, 4.81.0, 4.82.0, 4.83.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 PatchThird Party Advisory
https://hhvm.com/blog/2020/11/12/security-update.html Release NotesVendor Advisory
https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 PatchThird Party Advisory
https://hhvm.com/blog/2020/11/12/security-update.html Release NotesVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-1916), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.