CVE-2018-6334
Multipart-file uploads call variables to be improperly registered in the global scope.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.91%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.91% probability · 80th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-621, CWE-20
- Affected
- facebook/hhvm
- Source
- cve-assign@fb.com
EPSS 1.9% 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
- https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffPatch, Third Party Advisory
- https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlPatch, Third Party Advisory
- https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffPatch, Third Party Advisory
- https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.