CVE-2023-39475Public exploitNetwork attack vector

Unauthenticated code execution via unfiltered object deserialization

Published May 3, 2024 · Updated Aug 2, 2024

Unsafe deserialization in Inductive Automation Ignition 8.1.22 through 8.1.34 allows remote attackers to execute code via Gateway Network requests. ParameterVersionJavaSerializationCodec.decode calls ObjectInputStream.readObject on attacker-controlled data without filtering, allowlists, or type checks. Exploitation is unauthenticated but requires a configured Gateway Network and two requests to register the codec before a crafted object stream executes as SYSTEM.

CVSS severity9.8
Critical
EPSS probability64.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Inductive Automation Ignition 8.1.22 through 8.1.34 allows remote attackers to execute code via Gateway Network requests. ParameterVersionJavaSerializationCodec.decode calls ObjectInputStream.readObject on attacker-controlled data without filtering, allowlists, or type checks. Exploitation is unauthenticated but requires a configured Gateway Network and two requests to register the codec before a crafted object stream executes as SYSTEM.

The record

CVE
CVE-2023-39475
Published
May 3, 2024
Updated
Aug 2, 2024
Vendor
Inductive Automation
Product
Ignition
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.1.22 <8.1.35
  2. Affected versionversion=8.1.25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Inductive Automation · Ignitionversion=8.1.22 <8.1.35; version=8.1.25

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Zero Day InitiativeCVSS:3.0/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.

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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-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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