What’s Vulnerable › Vulnerabilities

CVE-2016-6870

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-02-17 · updated 2026-06-17
• Weakness: CWE-787

Description

Out-of-bounds write in the (1) mb_detect_encoding, (2) mb_send_mail, and (3) mb_detect_order functions in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors.

Affected products

• Facebook HHVM: through 3.14.5

References

• http://www.openwall.com/lists/oss-security/2016/08/11/1
• http://www.openwall.com/lists/oss-security/2016/08/19/1
• https://github.com/facebook/hhvm/commit/365abe807cab2d60dc9ec307292a06181f77a9c2
• http://www.openwall.com/lists/oss-security/2016/08/11/1
• http://www.openwall.com/lists/oss-security/2016/08/19/1
• https://github.com/facebook/hhvm/commit/365abe807cab2d60dc9ec307292a06181f77a9c2

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