How severe is CVE-2014-6229?

CVE-2014-6229 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2014-6229 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-6229?

CVE-2014-6229 affects Facebook Hiphop Virtual Machine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2014-6229?

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

When was CVE-2014-6229 published?

CVE-2014-6229 was published on 2014-12-28 and last updated on 2026-06-17.

CVE-2014-6229

CVE-2014-6229 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Facebook Hiphop Virtual Machine
Published: 2014-12-28
Last modified: 2026-06-17

Description

The HashContext class in hphp/runtime/ext/ext_hash.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 incorrectly expects that a certain key string uses '\0' for termination, which allows remote attackers to obtain sensitive information by leveraging read access beyond the end of the string, and makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging truncation of a string containing an internal '\0' character.

Frequently asked questions

What is CVE-2014-6229?: The HashContext class in hphp/runtime/ext/ext_hash.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 incorrectly expects that a certain key string uses '\0' for termination, which allows remote attackers to obtain sensitive information by leveraging read access beyond the end of the string, and makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging truncation of a string containing an internal '\0' character.
How severe is CVE-2014-6229?: CVE-2014-6229 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2014-6229 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-6229?: CVE-2014-6229 affects Facebook Hiphop Virtual Machine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2014-6229?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-6229 published?: CVE-2014-6229 was published on 2014-12-28 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Facebook Hiphop Virtual Machine

CVE-2019-3570 — Critical (CVSS 9.8): Call to the scrypt_enc() function in HHVM can lead to heap corruption by using specifically crafted parameters (N, r…
CVE-2014-6228 — High (CVSS 7.5): Integer overflow in the string_chunk_split function in hphp/runtime/base/zend-string.cpp in Facebook HipHop Virtual…
CVE-2014-2208 — High (CVSS 7.5): CRLF injection vulnerability in the LightProcess protocol implementation in hphp/util/light-process.cpp in Facebook…
CVE-2014-5386 — Medium (CVSS 5.0): The mcrypt_create_iv function in hphp/runtime/ext/mcrypt/ext_mcrypt.cpp in Facebook HipHop Virtual Machine (HHVM)…
CVE-2014-2209 — Medium (CVSS 5.0): Facebook HipHop Virtual Machine (HHVM) before 3.1.0 does not drop supplemental group memberships within…
CVE-2014-9714 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in the WddxPacket::recursiveAddVar function in HHVM (aka the HipHop Virtual…

All CVEs affecting Facebook Hiphop Virtual Machine →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →