Vulnerability in Facebook Hermes
CVE-2020-1911
A type confusion vulnerability when resolving properties of JavaScript objects with specially-crafted prototype chains in Facebook Hermes prior to commit fe52854cdf6725c2eaa9e125995da76e6ceb27da allows attackers to potentially 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: 0.020 (79.4th 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 fe52854cdf6725c2eaa9e125995da76e6ceb27da
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-assign@fb.com (x_refsource_CONFIRM, Third Party Advisory)
- cve-assign@fb.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1911?
- CVE-2020-1911 is a critical-severity vulnerability in Facebook Hermes, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2020-09-04.
- How severe is CVE-2020-1911?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-1911 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.