CVE-2023-39476: Inductive Automation Ignition JavaSerializationCodec Deserialization of Untrusted Data Remote Code Execution V

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-39476 is a critical-severity flaw (CVSS 9.8) affecting ignition. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Inductive Automation Ignition JavaSerializationCodec Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Inductive Automation Ignition. Authentication is not required to exploit this vulnerability. The specific flaw exists within the JavaSerializationCodec class. The issue results from the lack of proper validation of user-supplie

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-502
Published	2024-05-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: inductiveautomation

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-05-03 03:15 UTCPublished CVE record published
2026-06-17 06:12 UTCUpdated Record last modified

inductiveautomation ignition UPGRADE

Affected: >= 8.1.0 and < 8.1.35

Fixed in: 8.1.35

Safe to downgrade to: a release before 8.1.0

1. Check installed version

apt-cache policy ignition || rpm -q ignition || ignition --version

2. UPGRADE to 8.1.35 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ignition

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ignition

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.1.0 (Debian / Ubuntu)

apt-cache madison ignition sudo apt install ignition=<VERSION_BEFORE_8.1.0> sudo apt-mark hold ignition

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ignition sudo dnf downgrade ignition-<VERSION_BEFORE_8.1.0> sudo dnf versionlock add ignition

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-39476?

ignition: upgrade to 8.1.35. Exact commands for each OS are on this page.

Is CVE-2023-39476 being exploited?

CVE-2023-39476 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-39476 affect?

CVE-2023-39476 affects ignition. Severity is critical (CVSS 9.8). Inductive Automation Ignition JavaSerializationCodec Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Inductive Automati

How urgent is CVE-2023-39476?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

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References

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