CVE-2023-34867Public exploitNetwork attack vector

Engine crash via invalid property hashmap entry

Published Jun 14, 2023 · Updated Jan 3, 2025

Reachable assertion in JerryScript 3.0 allows remote attackers to crash the JavaScript engine by executing crafted JavaScript. Repeated WeakSet construction over self-referential arrays drives property insertion into ecma_property_hashmap_create with an entry that fails ECMA_PROPERTY_IS_PROPERTY_PAIR. The proof of concept aborts a debug build and causes an invalid-read segmentation fault in a release build, while network reachability depends on an embedding application accepting attacker-controlled scripts.

CVSS severity7.5
High
EPSS probability0.73%
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 allows remote attackers to crash the JavaScript engine by executing crafted JavaScript. Repeated WeakSet construction over self-referential arrays drives property insertion into ecma_property_hashmap_create with an entry that fails ECMA_PROPERTY_IS_PROPERTY_PAIR. The proof of concept aborts a debug build and causes an invalid-read segmentation fault in a release build, while network reachability depends on an embedding application accepting attacker-controlled scripts.

The record

CVE
CVE-2023-34867
Published
Jun 14, 2023
Updated
Jan 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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