CVE-2021-24036

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.

• CWE-122
• CWE-190

• https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3Patch, Third Party Advisory
• https://hhvm.com/blog/2021/07/20/security-update.htmlProduct, Vendor Advisory
• https://www.facebook.com/security/advisories/cve-2021-24036Vendor Advisory
• https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3Patch, Third Party Advisory
• https://hhvm.com/blog/2021/07/20/security-update.htmlProduct, Vendor Advisory
• https://www.facebook.com/security/advisories/cve-2021-24036Vendor Advisory

Published

Jul 23, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-2403Vulnerability in the Oracle WebLogic Server product of Oracl…5.3
• CVE-2021-24030The fbgames protocol handler registered as part of Facebook …9.8
• CVE-2021-24031In the Zstandard command-line utility prior to v1.4.1, outpu…5.5
• CVE-2021-24032Beginning in v1.4.1 and prior to v1.4.9, due to an incomplet…4.7
• CVE-2021-24033react-dev-utils prior to v11.0.4 exposes a function, getProc…5.6
• CVE-2021-24035A lack of filename validation when unzipping archives prior …9.1
• CVE-2021-24037A use after free in hermes, while emitting certain error mes…9.8
• CVE-2021-24038Due to a bug with management of handles in OVRServiceLaunche…7.8
• CVE-2021-2404Vulnerability in the PeopleSoft Enterprise HCM Candidate Gat…6.5
• CVE-2021-24040Due to use of unsafe YAML deserialization logic, an attacker…9.8
• CVE-2021-24041A missing bounds check in image blurring code prior to Whats…9.8
• CVE-2021-24042The calling logic for WhatsApp for Android prior to v2.21.23…9.8