CVE-2021-46345Public exploit

Process crash via CESU-8 conversion assertion

Published Jan 20, 2022 · Updated Aug 4, 2024

Reachable assertion in JerryScript 3.0.0 allows local users to crash the JavaScript engine through a crafted script. The lit_convert_cesu8_string_to_utf8_string routine completes a CESU-8 conversion with its cursor unequal to the expected end pointer, triggering a fatal assertion in lit-strings.c. Execution of the crafted script requires user interaction; the demonstrated consequence is process termination, with no reported data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in JerryScript 3.0.0 allows local users to crash the JavaScript engine through a crafted script. The lit_convert_cesu8_string_to_utf8_string routine completes a CESU-8 conversion with its cursor unequal to the expected end pointer, triggering a fatal assertion in lit-strings.c. Execution of the crafted script requires user interaction; the demonstrated consequence is process termination, with no reported data exposure or modification.

The record

CVE
CVE-2021-46345
Published
Jan 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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