CVE-2019-11936

Name: CVE-2019-11936
Creator: NVD / NIST
Published: 2019-12-04T17:16:43.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.48%

Last modified Jun 17, 2026

CVE-2019-11936 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Various APC functions accept keys containing null bytes as input, leading to premature truncation of input. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.. EPSS estimates a 1.48% chance of exploitation in the next 30 days.

Description

Various APC functions accept keys containing null bytes as input, leading to premature truncation of input. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.48%

70.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-626

Affected Software

Vendor	Product	Versions
Facebook	Hhvm	< 3.30.12
Facebook	Hhvm	>= 4.0.0, <= 4.8.5
Facebook	Hhvm	>= 4.9.0, <= 4.23.1
Facebook	Hhvm	4.24.0
Facebook	Hhvm	4.25.0
Facebook	Hhvm	4.26.0
Facebook	Hhvm	4.27.0
Facebook	Hhvm	4.28.0
Facebook	Hhvm	4.28.1

References

https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373Patch, Third Party Advisory
https://hhvm.com/blog/2019/10/28/security-update.htmlVendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11936Vendor Advisory
https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373Patch, Third Party Advisory
https://hhvm.com/blog/2019/10/28/security-update.htmlVendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11936Vendor Advisory

Timeline

Published: Dec 4, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11936?

How severe is CVE-2019-11936?

CVE-2019-11936 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.48% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11936?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11936?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST