CVE-2021-24036
highpriority · track · 40EPSS 0.033 · 88 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (20)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3cnnvd
- https://hhvm.com/blog/2021/07/20/security-update.htmlcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-24036cnnvd
- https://www.facebook.com/security/advisories/cve-2021-24036cnnvd
- https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3enisa_euvd
- https://hhvm.com/blog/2021/07/20/security-update.htmlenisa_euvd
- https://www.facebook.com/security/advisories/cve-2021-24036enisa_euvd
- https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3PatchThird Party Advisorynvd
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