CVE-2021-24036

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

3.28% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 87.4% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-23 00:30Z5 YR AGO

Last updated

2024-08-03 19:21Z2 YR AGO

Reserved

2021-01-13

Assigning CNA

facebook

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-190Integer Overflow or WraparoundBase

Data version

5.1

Document digest

39d558f64f2d673e4b3e47f56e3b70697879c256bdcf7733c3b9b97f3748bd12

• hhvm.comhttps://hhvm.com/blog/2021/07/20/security-update.htmlx_refsource_CONFIRM
• github.comhttps://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3x_refsource_MISC
• www.facebook.comhttps://www.facebook.com/security/advisories/cve-2021-24036x_refsource_CONFIRM