CVE-2018-6345

Name: CVE-2018-6345
Creator: NVD / NIST
Published: 2019-01-15T22:29:00.25+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2018-6345 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).

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

1.75%

75.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Hhvm	<= 3.27.5
Facebook	Hhvm	>= 3.28.0, <= 3.30.1

References

https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3Patch, Third Party Advisory
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlRelease Notes, Vendor Advisory
https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3Patch, Third Party Advisory
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlRelease Notes, Vendor Advisory

Timeline

Published: Jan 15, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6345?

How severe is CVE-2018-6345?

CVE-2018-6345 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6345?

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-2018-6345?

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

Scan your code now

Source: NVD / NIST