Vulnerability · Published Jul 23, 2021 · Assigned by facebook

CVE-2021-24036

Critical 9.8

In plain English

A critical-severity heap buffer overflow in folly from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 89% of all known vulnerabilities).

Severity (CVSS NVD)9.8Critical

Exploit odds (30 days)3.3%top 11.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
Facebook	folly	unspecified – before v2021.07.22.00
Facebook	HHVM	4.118.0 – before unspecified4.117.04.116.04.115.0

Weakness: CWE-122

References

https://hhvm.com/blog/2021/07/20/security-update.html x_refsource_CONFIRM
https://github.com/facebook/folly/commit/4f304af1411e68851bdd00ef6140e9de4616f7d3 x_refsource_MISC
https://www.facebook.com/security/advisories/cve-2021-24036 x_refsource_CONFIRM