Vulnerability · Published Dec 13, 2021 · Assigned by facebook
CVE-2021-24045
Critical 9.8
In plain English
A critical-severity type confusion in Hermes from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.3%top 30.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A type confusion vulnerability could be triggered when resolving the "typeof" unary operator in Facebook Hermes prior to v0.10.0. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.
Affected products (as reported)
Weakness: CWE-843
References
- https://www.facebook.com/security/advisories/cve-2021-24045 x_refsource_CONFIRM
- https://github.com/facebook/hermes/commit/55e1b2343f4deb1a1b5726cfe1e23b2068217ff2 x_refsource_MISC