CVE-2023-34868Public exploitNetwork attack vector

Engine crash via reachable parser assertion

Published Jun 14, 2023 · Updated Jan 2, 2025

Reachable assertion in JerryScript 3.0.0 allows attackers to crash the JavaScript engine by supplying crafted JavaScript source. The parser_parse_for_statement_start function applies a fatal assertion to a right-parenthesis token reached while parsing the crafted class-and-loop sequence. The trigger must reach an embedding application's script-parsing path; the demonstrated consequence is a process abort, not code execution.

CVSS severity7.5
High
EPSS probability0.74%
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 attackers to crash the JavaScript engine by supplying crafted JavaScript source. The parser_parse_for_statement_start function applies a fatal assertion to a right-parenthesis token reached while parsing the crafted class-and-loop sequence. The trigger must reach an embedding application's script-parsing path; the demonstrated consequence is a process abort, not code execution.

The record

CVE
CVE-2023-34868
Published
Jun 14, 2023
Updated
Jan 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

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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