CVE-2016-3989: The NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANTIME M1000, IMS-LANTIME M500, LANTIME M900

Q: How do I fix CVE-2016-3989?

ntp server firmware: upgrade to newer than 6.0; ims-lantime m1000: mitigate or apply the listed mitigation; ims-lantime m3000: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2016-3989 being exploited?

CVE-2016-3989 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-3989 affect?

CVE-2016-3989 affects ntp server firmware, ims-lantime m1000, ims-lantime m3000. Severity is high (CVSS 8.1). The NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANTIME M1000, IMS-LANTIME M500, LANTIME M900, LANTIME M600, LANTIME M400, LANTIME M300, LANTIME M200, LANTIME M100, SyncFire 1100, and LCES devices with firmware before 6.20.

Q: How urgent is CVE-2016-3989?

Priority 56/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

This month

HIGH 8.1UPGRADEMITIGATEMITIGATE

CVE-2016-3989 is a high-severity flaw (CVSS 8.1) affecting ntp server firmware, ims-lantime m1000, ims-lantime m3000. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANTIME M1000, IMS-LANTIME M500, LANTIME M900, LANTIME M600, LANTIME M400, LANTIME M300, LANTIME M200, LANTIME M100, SyncFire 1100, and LCES devices with firmware before 6.20.004 allows remote authenticated users to obtain root privileges for writing to unspecified scripts, and consequently obtain sensitive information or modify data, by leveraging access to the nobody account.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	5.1% (top 8%)
CISA exploited list	No
Weakness	CWE-264
Published	2016-07-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: meinberg

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

Am I affected?

Timeline

2016-07-03 14:59 UTCPublished CVE record published
2026-06-17 00:46 UTCUpdated Record last modified

meinberg ntp server firmware UPGRADE

Affected: <= 6.0

Fixed in: newer than 6.0

Safe to downgrade to: no unaffected older release

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.

meinberg ims-lantime m1000 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

meinberg ims-lantime m3000 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

meinberg ims-lantime m500 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

meinberg lantime m100 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

meinberg lantime m200 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Meinberg NTP Time Server ELX800/GPS M4x V5.30p - Remote Command Execution / Escalate Privileges

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-2016-3989?

ntp server firmware: upgrade to newer than 6.0; ims-lantime m1000: mitigate or apply the listed mitigation; ims-lantime m3000: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-3989 being exploited?

CVE-2016-3989 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-2016-3989 affect?

CVE-2016-3989 affects ntp server firmware, ims-lantime m1000, ims-lantime m3000. Severity is high (CVSS 8.1). The NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANTIME M1000, IMS-LANTIME M500, LANTIME M900, LANTIME M600, LANTIME M400, LANTIME M300, LANTIME M200, LANTIME M100, SyncFire 1100, and LCES devices with firmware before 6.20.

How urgent is CVE-2016-3989?

Priority 56/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2016-3988 HIGH 7.3 UPGRADE MITIGATE Multiple stack-based buffer overflows in the NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANT
CVE-2016-3962 HIGH 7.3 UPGRADE MITIGATE Stack-based buffer overflow in the NTP time-server interface on Meinberg IMS-LANTIME M3000, IMS-LANTIME M1000,
CVE-2014-5417 HIGH 7.5 MITIGATE UPGRADE Cross-site scripting (XSS) vulnerability in Meinberg NTP Server firmware on LANTIME M-Series devices 6.15.019

References

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