CVE-2016-1000005

Name: CVE-2016-1000005
Creator: NVD / NIST
Published: 2020-02-19T13:15:10.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.39%

Last modified Jun 17, 2026

CVE-2016-1000005 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).. EPSS estimates a 1.39% chance of exploitation in the next 30 days.

Description

mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

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

1.39%

68.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Facebook	Hhvm	< 3.9.5
Facebook	Hhvm	>= 3.10.0, <= 3.12.3
Facebook	Hhvm	>= 3.13.0, <= 3.14.1

References

https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89Patch, Third Party Advisory
https://www.facebook.com/security/advisories/cve-2016-1000005Third Party Advisory
https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89Patch, Third Party Advisory
https://www.facebook.com/security/advisories/cve-2016-1000005Third Party Advisory

Timeline

Published: Feb 19, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-1000005?

How severe is CVE-2016-1000005?

CVE-2016-1000005 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.39% probability of exploitation in the next 30 days.

How do I fix CVE-2016-1000005?

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-2016-1000005?

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

Scan your code now

Source: NVD / NIST