Is CVE-2021-38395 actively exploited?

No active exploitation of CVE-2021-38395 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-38395 be exploited remotely?

Yes. CVE-2021-38395 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-38395?

CVE-2021-38395 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-38395

CRITICAL

CVE-2021-38395

CWE-74Published: October 28, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to improper neutralization of special elements in output, which may allow an attacker to remotely execute arbitrary code and cause a denial-of-service condition.

NVD Source

Risk Analysis

Honeywell Experion PKS controllers are susceptible to improper neutralization of special elements, allowing for remote code execution and denial-of-service. The critical nature of this flaw is reflected in its 9.8 CVSS score.

No public exploit is known, and the vulnerability is not included in the CISA KEV catalog.

Recommended Action

Update the firmware on affected Honeywell controllers to the latest secure version.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-38395 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.