CVE-2019-11930

Q: How do I fix CVE-2019-11930?

Upgrade hhvm to 3.30.12 or later.

Q: Is CVE-2019-11930 being actively exploited?

Not that we know of. CVE-2019-11930 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 88% of all scored CVEs.

Q: How severe is CVE-2019-11930?

CVE-2019-11930 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2019-11930 affect?

Published advisories record a fix for hhvm (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 88th pctl

9.8

CVSS v3

NVD

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.

CWE-763

How to fix

Remediation Available

hhvmNVD

Affected:< 3.30.12Fixed in:3.30.12CVE-2019-11930derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.25%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

github.com

Vendor Advisory2

Related Vulnerabilities

Other CWE-763 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2007-4367	High	9.3	8.2%	-	Fix
CVE-2015-2695	Medium	5.0	6.2%	-	Fix
CVE-2013-4695	High	7.8	5.3%	-	-
CVE-2020-36224	High	7.5	4.3%	-	Fix
CVE-2022-31625	High	8.1	3.8%	-	Fix
CVE-2021-42377	Critical	9.8	3.6%	-	Fix

Common questions

How do I fix CVE-2019-11930?

Upgrade hhvm to 3.30.12 or later.

Is CVE-2019-11930 being actively exploited?

Not that we know of. CVE-2019-11930 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 88% of all scored CVEs.

How severe is CVE-2019-11930?

CVE-2019-11930 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-11930 affect?

Published advisories record a fix for hhvm (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.