CVE-2022-41648: The HEIDENHAIN Controller TNC 640 NC software Version 340590 07 SP5, is vulnerable to improper authentication

This month

CRITICAL 9.8REMOTEDOWNGRADEMITIGATE

CVE-2022-41648 is a critical-severity flaw (CVSS 9.8) affecting tnc 640 programming station, heros. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The HEIDENHAIN Controller TNC 640 NC software Version 340590 07 SP5, is vulnerable to improper authentication in its DNC communication for CNC machines. Authentication is not enabled by default for DNC communication. This vulnerability may allow an attacker to deny service on the production line, steal sensitive data from the production line, and alter any products created by the production line. Note: CNC machines running the TNC 640 controller

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-1188, CWE-287
Published	2022-10-28
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: heidenhain

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

Am I affected?

Timeline

2022-10-28 18:15 UTCPublished CVE record published
2026-06-17 05:03 UTCUpdated Record last modified

heidenhain tnc 640 programming station DOWNGRADE

Affected: 340590_07 sp5

Fixed in: no fixed release known

Safe to downgrade to: a release before 340590_07

1. Check installed version

apt-cache policy tnc-640-programming-station || rpm -q tnc-640-programming-station || tnc-640-programming-station --version

2. No fixed release: DOWNGRADE to a release before 340590_07 (Debian / Ubuntu)

apt-cache madison tnc-640-programming-station sudo apt install tnc-640-programming-station=<VERSION_BEFORE_340590_07> sudo apt-mark hold tnc-640-programming-station

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tnc-640-programming-station sudo dnf downgrade tnc-640-programming-station-<VERSION_BEFORE_340590_07> sudo dnf versionlock add tnc-640-programming-station

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.

heidenhain heros MITIGATE

Affected: 5.08.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.08.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-41648?

tnc 640 programming station: downgrade or apply the listed mitigation; heros: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-41648 being exploited?

CVE-2022-41648 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-2022-41648 affect?

CVE-2022-41648 affects tnc 640 programming station, heros. Severity is critical (CVSS 9.8). The HEIDENHAIN Controller TNC 640 NC software Version 340590 07 SP5, is vulnerable to improper authentication in its DNC communication for CNC machines. Authentication is not enabled by default for DNC communication. This vulnerability may

How urgent is CVE-2022-41648?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

References

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