How severe is CVE-2014-5386?

CVE-2014-5386 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2014-5386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-5386?

CVE-2014-5386 affects Facebook Hiphop Virtual Machine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2014-5386?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2014-5386 published?

CVE-2014-5386 was published on 2014-12-28 and last updated on 2026-06-17.

CVE-2014-5386

CVE-2014-5386 is a medium-severity vulnerability in Facebook Hiphop Virtual Machine with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Facebook Hiphop Virtual Machine
Published: 2014-12-28
Last modified: 2026-06-17

Description

The mcrypt_create_iv function in hphp/runtime/ext/mcrypt/ext_mcrypt.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 does not seed the random number generator, which makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging the use of a single initialization vector.

Frequently asked questions

What is CVE-2014-5386?: The mcrypt_create_iv function in hphp/runtime/ext/mcrypt/ext_mcrypt.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 does not seed the random number generator, which makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging the use of a single initialization vector.
How severe is CVE-2014-5386?: CVE-2014-5386 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2014-5386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-5386?: CVE-2014-5386 affects Facebook Hiphop Virtual Machine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2014-5386?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-5386 published?: CVE-2014-5386 was published on 2014-12-28 and last updated on 2026-06-17.

References

https://github.com/facebook/hhvm/commit/ab6fdeb84fb090b48606b6f7933028cfe7bf3a5e

Affected products (1)

cpe:2.3:a:facebook:hiphop_virtual_machine:*:*:*:*:*:*:*:*

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