HOMEVULNERABILITIESCVE-2021-24045
CRITICAL

CVE-2021-24045

CWE-843Published: December 13, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A type confusion vulnerability could be triggered when resolving the "typeof" unary operator in Facebook Hermes prior to v0.10.0. 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-2021-24045 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/55e1b2343f4deb1a1b5726cfe1e23b2068217ff2
PATCHhttps://github.com/facebook/hermes/commit/55e1b2343f4deb1a1b5726cfe1e23b2068217ff2
ADVISORYhttps://www.facebook.com/security/advisories/cve-2021-24045
ADVISORYhttps://www.facebook.com/security/advisories/cve-2021-24045

All References (4)

→
https://github.com/facebook/hermes/commit/55e1b2343f4deb1a1b5726cfe1e23b2068217ff2Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2021-24045Vendor Advisory
→
https://github.com/facebook/hermes/commit/55e1b2343f4deb1a1b5726cfe1e23b2068217ff2Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2021-24045Vendor Advisory

Quick Facts

CVE IDCVE-2021-24045
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-843
CISA KEVNo
Affected1 vendor(s)
PublishedDec 13, 2021

Related CVEs (CWE-843)

CVE-2010-2299
10.0
CVE-2021-33970
10.0
CVE-2019-7117
9.8
CVE-2025-59717
9.8
CVE-2019-7128
9.8
CVE-2019-10231
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-24045 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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