CVE-2018-6340 | BDVDB-2026-111135 Detail

FacebookHHVM

Description#

The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-125 Out-of-bounds Read

References#

Exploit#

No public exploit known

History#

Version 12018-12-31Record published in the CVE List.
Version 22025-05-06Most recent update recorded in the CVE List.

Published

Published: 2018-12-31
Last modified: 2025-05-06

Vendor information

Vendor: Facebook
Product: HHVM

All Facebook vulnerabilities

Score

8.1 High

EPSS

1.4%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 73.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
3.30.1
Fixed
Not stated
Vulnerable
3.30.0
Fixed
Not stated
Vulnerable
3.27.5
Fixed
Not stated
Vulnerable
< 3.27.5
Fixed
3.27.5

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.1 High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).