Vulnerability in Facebook Hermes
CVE-2023-23557
An error in Hermes' algorithm for copying objects properties prior to commit a00d237346894c6067a594983be6634f4168c9ad could be used by a malicious attacker to execute arbitrary code via type confusion. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Facebook Hermes — versions 0
Weakness classification (CWE)
References
- www.facebook.com/security/advisories/cve-2023-23557 (Patch, Vendor Advisory)
- github.com/facebook/hermes/commit/a00d237346894c6067a594983be6634f4168c9ad (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-23557?
- CVE-2023-23557 is a critical-severity vulnerability in Facebook Hermes, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2023-05-18.
- How severe is CVE-2023-23557?
- Critical severity. CVSS v3 base score is 9.8 out of 10.