---
title: "CVE-2023-29300: Adobe ColdFusion Deserialization of Untrusted Data Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-29300/
description: "CVE-2023-29300 (Adobe ColdFusion): Exploited in the wild (CISA KEV). Adobe ColdFusion versions 2018u16 (and earlier), 2021u6 (and earlier) and…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-07-12
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-29300"
kev: true
cvss: 9.8
epss: 0.99991
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2023-29300: Adobe ColdFusion Deserialization of Untrusted Data Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Adobe ColdFusion. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-01-08, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-01-29 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 100.0% , percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

Adobe ColdFusion versions 2018u16 (and earlier), 2021u6 (and earlier) and 2023.0.0.330468 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in Arbitrary code execution. Exploitation of this issue does not require user interaction.

## Affected products (CVE record)

- Adobe ColdFusion: <= 2023.0.0.330468

## Severity

- adobe CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-01-08; federal due date 2024-01-29. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.99% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [helpx.adobe.com](https://helpx.adobe.com/security/products/coldfusion/apsb23-40.html)
- [CVE.org record CVE-2023-29300](https://www.cve.org/CVERecord?id=CVE-2023-29300)
- [NVD entry CVE-2023-29300](https://nvd.nist.gov/vuln/detail/CVE-2023-29300)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-29300)

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Source page: https://erroneo.us/security/cve/CVE-2023-29300/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt