CVE-2018-6337

HIGH
7.5
CVSS Score
Published: December 31, 2018 at 10:00 PM UTC
Updated: June 17, 2026 at 02:01 AM UTC
2 products affected across 1 vendorHHVMFolly

Using HHVM by Facebook?

Get instant alerts when new vulnerabilities affect HHVM - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

folly::secureRandom will re-use a buffer between parent and child processes when fork() is called. That will result in multiple forked children producing repeat (or similar) results. This affects HHVM 3.26 prior to 3.26.3 and the folly library between v2017.12.11.00 and v2018.08.09.00.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≥ v2017.12.11.002017.12.11.00 ≤ v ≤ 2018.08.09.002017.12.11.002018.08.09.00
Vendor states this is fixed in v2017.12.11.00 (unaffected)
v ≥ 3.26.03.26 ≤ v < 3.26.33.26.03.26.3
Vendor states this is fixed in 3.26.0 (unaffected)
Affected range stops below 3.26.3, so it looks safe — our inference, not a vendor statement

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-212CWE-119

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card