CVE-2019-11930

Name: CVE-2019-11930
Creator: NVD / NIST
Published: 2019-12-04T17:16:43.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.25%

Last modified Jun 17, 2026

CVE-2019-11930 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An invalid free in mb_detect_order can cause the application to crash or potentially result in remote code execution. 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 3.25% chance of exploitation in the next 30 days.

Description

An invalid free in mb_detect_order can cause the application to crash or potentially result in remote code execution. 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

3.25%

86.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

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/524d2e60cfe910406ec6109e4286d7edd545ab36Patch
https://hhvm.com/blog/2019/10/28/security-update.htmlVendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11930Vendor Advisory
https://github.com/facebook/hhvm/commit/524d2e60cfe910406ec6109e4286d7edd545ab36Patch
https://hhvm.com/blog/2019/10/28/security-update.htmlVendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11930Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2019-11930?

How severe is CVE-2019-11930?

CVE-2019-11930 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.25% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11930?

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-2019-11930?

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

Scan your code now

Source: NVD / NIST