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.

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 arbi…

EPSS: 0.020 (78.6th 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)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

Public proof-of-concept exploits

404notf0und/CVE-Flow

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.