CVE-2021-24036

CRITICAL
9.8
CVSS Score
Published: July 23, 2021 at 12:30 AM UTC
Updated: June 17, 2026 at 03:39 AM UTC
2 products affected across 1 vendorHHVMFolly

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

Description

Passing an attacker controlled size when creating an IOBuf could cause integer overflow, leading to an out of bounds write on the heap with the possibility of remote code execution. This issue affects versions of folly prior to v2021.07.22.00. This issue affects HHVM versions prior to 4.80.5, all versions between 4.81.0 and 4.102.1, all versions between 4.103.0 and 4.113.0, and versions 4.114.0, 4.115.0, 4.116.0, 4.117.0, 4.118.0 and 4.118.1.

Affected

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

v < 2021.07.22.00v < v2021.07.22.00
Affected range stops below 2021.07.22.00, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in v2021.07.22.00 (unaffected)
v ≥ 4.102.0v ≥ 4.118.0v ≥ 4.81.0v < 4.80.54.103.0 ≤ v ≤ 4.113.04.81.0 ≤ v ≤ 4.102.14.102.04.113.04.114.04.115.04.116.04.117.04.118.04.118.14.81.0
Vendor states this is fixed in 4.102.2 (unaffected)
Vendor states this is fixed in 4.113.1 (unaffected)
Vendor states this is fixed in 4.114.1 (unaffected)
Vendor states this is fixed in 4.115.1 (unaffected)
Vendor states this is fixed in 4.116.1 (unaffected)
Vendor states this is fixed in 4.117.1 (unaffected)
Vendor states this is fixed in 4.118.2 (unaffected)
Vendor states this is fixed in 4.80.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-190

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