{"cve":"CVE-2020-1914","nvd":{"published":"2020-10-08T19:15:12.080","modified":"2026-06-17T03:02:36.357","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-670"],"references":["https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc","https://www.facebook.com/security/advisories/cve-2020-1914","https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc","https://www.facebook.com/security/advisories/cve-2020-1914"],"products":["facebook:hermes"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2020-1914","score":0.02515,"percentile":0.84813,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-327c-qx3v-h673","url":"https://osv.dev/vulnerability/GHSA-327c-qx3v-h673","summary":"Always-Incorrect Control Flow Implementation in Facebook Hermes","modified":"2023-11-08T04:02:45.253678Z","packages":[{"ecosystem":"npm","name":"hermes-engine","purl":"pkg:npm/hermes-engine","ranges":["<0.7.2"],"fixed":["0.7.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}