Vulnerability in Facebook Hermes
CVE-2020-1914
A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.
EPSS: 0.025 (83.7th percentile) — read the EPSS interpretation.
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.
Affected products
- Facebook Hermes — versions commit prior to b2021df620824627f5a8c96615edbd1eb7fdddfc
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-assign@fb.com (x_refsource_CONFIRM, Vendor Advisory)
- cve-assign@fb.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1914?
- CVE-2020-1914 is a critical-severity vulnerability in Facebook Hermes, classified under Always-Incorrect Control Flow Implementation. CVSS score: 9.8/10. Published 2020-10-08.
- How severe is CVE-2020-1914?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-1914 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.