CVE-2021-38399

7.5 HIGH 0.9% exploit odds No fix listed

What it is

Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2022-10-28 02:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 04:02 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2022-10-28 02:15 UTC
Last modified: 2026-06-17 04:02 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Weakness: CWE-23
Record status: Modified

Affected

Honeywell c200 Firmware
Honeywell c200e Firmware
Honeywell c300 Firmware
Honeywell Application Control Environment Firmware

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-38399.md and follow it. Check whether this project is affected by CVE-2021-38399. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record