CVE-2016-6871
Integer overflow in bcmath in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, which triggers a buffer overflow.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Integer overflow in bcmath in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, which triggers a buffer overflow.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.33% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- facebook/hhvm
- Source
- cve@mitre.org
EPSS 2.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2016/08/11/1Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/08/19/1Mailing List, Patch, Third Party Advisory
- https://github.com/facebook/hhvm/commit/c00fc9d3003eb06226b58b6a48555f1456ee2475Patch
- http://www.openwall.com/lists/oss-security/2016/08/11/1Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/08/19/1Mailing List, Patch, Third Party Advisory
- https://github.com/facebook/hhvm/commit/c00fc9d3003eb06226b58b6a48555f1456ee2475Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.