CVE-2022-43286Public exploitNetwork attack vector

Process crash via JSON reviver use-after-free

Published Oct 28, 2022 · Updated May 7, 2025

Heap use-after-free in F5 njs 0.7.2 allows remote attackers to crash a worker through crafted JSON processed with a reviver. During JSON.parse reviver traversal, array conversion frees the fast-array allocation while njs_json_parse_iterator_call retains a pointer and passes it to memcpy. The application must route attacker-controlled JSON through a reviver; the public artifact demonstrates an AddressSanitizer abort, not arbitrary code execution.

CVSS severity9.8
Critical
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap use-after-free in F5 njs 0.7.2 allows remote attackers to crash a worker through crafted JSON processed with a reviver. During JSON.parse reviver traversal, array conversion frees the fast-array allocation while njs_json_parse_iterator_call retains a pointer and passes it to memcpy. The application must route attacker-controlled JSON through a reviver; the public artifact demonstrates an AddressSanitizer abort, not arbitrary code execution.

The record

CVE
CVE-2022-43286
Published
Oct 28, 2022
Updated
May 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 28, 2022CVE publishedPublication date reported by the CVE source.
  2. May 7, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-416Use After Free
T1499.004Application 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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