HOMEVULNERABILITIESCVE-2020-1914
CRITICAL

CVE-2020-1914

CWE-670Published: October 8, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-1914 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

facebook1 product(s)
hermes
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
PATCHhttps://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
ADVISORYhttps://www.facebook.com/security/advisories/cve-2020-1914
ADVISORYhttps://www.facebook.com/security/advisories/cve-2020-1914

All References (4)

→
https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfcPatch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2020-1914Vendor Advisory
→
https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfcPatch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2020-1914Vendor Advisory

Quick Facts

CVE IDCVE-2020-1914
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-670
CISA KEVNo
Affected1 vendor(s)
PublishedOct 8, 2020

Related CVEs (CWE-670)

CVE-2022-21679
9.8
CVE-2022-25745
9.8
CVE-2025-43359
9.8
CVE-2021-41153
9.8
CVE-2023-23623
9.8
CVE-2020-17466
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-1914 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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