CVE-2018-6334 — Multipart-file uploads call variables to be improperly registered in the global scope

Back Back to CVE browser

CRITICAL

Multipart-file uploads call variables to be improperly registered in the global scope

Published Dec 31, 2018

9.8

CRITICAL

CVSS 3.1

EPSS 1.91%

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).

Affected products

Vendor Facebook Product HHVM Default
n/a
- Version
  3.21.10
  Status
  affected
  Constraints
  -
- Version
  3.22.0
  Status
  affected
  Constraints
  -
- Version
  3.24.6
  Status
  affected
  Constraints
  -
- Version
  3.25.0
  Status
  affected
  Constraints
  -
- Version
  3.25.2
  Status
  affected
  Constraints
  -
- Version
  unspecified
  Status
  affected
  Constraints
  <3.21.10

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Facebook

HHVM

n/a

Version	Status	Constraints
3.21.10	affected	-
3.22.0	affected	-
3.24.6	affected	-
3.25.0	affected	-
3.25.2	affected	-
unspecified	affected	<3.21.10

Remediation

No remediation recorded yet.

Metrics

1.91% 0.01913

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01913

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.91% (0.01913)	79.08th	v5 (v2026.06.15)
Jun 15, 2026	1.91% (0.01913)	77.08th	v5 (v2026.06.15)
Jul 20, 2024	0.22% (0.00225)	61.23th	v3 (v2023.03.01)
May 23, 2024	0.22% (0.00225)	60.74th	v3 (v2023.03.01)
Mar 7, 2023	0.20% (0.00201)	56.27th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.62% (0.00624)	17.80th	v1
Jan 6, 2022	0.62% (0.00624)	17.24th	v1
Sep 1, 2021	0.62% (0.00624)	45.04th	v1
Apr 14, 2021	0.62% (0.00624)	0.00th	v1

Weaknesses (2)

CWE-20

Improper Input Validation

CWE-621

References (2)

https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cff
x_refsource_MISCPatchThird Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.html
x_refsource_MISCPatchThird Party Advisory

Link	Providers	Tags
https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cff		x_refsource_MISCPatchThird Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.html		x_refsource_MISCPatchThird Party Advisory