9.8

CVE-2020-1914: facebook hermes

CVSS: 9.8v3.1CriticalModified
AliasesGHSA-327c-qx3v-h673
Published 08-10-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-1914 is a critical (CVSS 9.8) vulnerability in facebook hermes. EPSS estimates a 2.51% chance of exploitation in the next 30 days, higher than 84.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
2.51%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-10-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.51%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

0.00 pp

From 2.51% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Facebook1 product
  • hermescommit prior to b2021df620824627f5a8c96615edbd1eb7fdddfc | < 2020-10-01
Npm1 product
  • hermes-engine< 0.7.2

2 vendors · 2 products

References

5 links