CVE-2020-29666: In Lan ATMService M3 ATM Monitoring System 6.1.0, due to a directory-listing vulnerability, a remote attacker

This month

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2020-29666 is a medium-severity flaw (CVSS 5.3) affecting m3 atm monitoring system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Lan ATMService M3 ATM Monitoring System 6.1.0, due to a directory-listing vulnerability, a remote attacker can view log files, located in /websocket/logs/, that contain a user's cookie values and the predefined developer's cookie value.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Published	2020-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lanatmservice

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

Am I affected?

Timeline

2020-12-10 09:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

lanatmservice m3 atm monitoring system DOWNGRADE

Affected: 6.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.1.0

1. Check installed version

apt-cache policy m3-atm-monitoring-system || rpm -q m3-atm-monitoring-system || m3-atm-monitoring-system --version

2. No fixed release: DOWNGRADE to a release before 6.1.0 (Debian / Ubuntu)

apt-cache madison m3-atm-monitoring-system sudo apt install m3-atm-monitoring-system=<VERSION_BEFORE_6.1.0> sudo apt-mark hold m3-atm-monitoring-system

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

dnf --showduplicates list m3-atm-monitoring-system sudo dnf downgrade m3-atm-monitoring-system-<VERSION_BEFORE_6.1.0> sudo dnf versionlock add m3-atm-monitoring-system

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.

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-2020-29666?

m3 atm monitoring system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-29666 being exploited?

CVE-2020-29666 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-2020-29666 affect?

CVE-2020-29666 affects m3 atm monitoring system. Severity is medium (CVSS 5.3). In Lan ATMService M3 ATM Monitoring System 6.1.0, due to a directory-listing vulnerability, a remote attacker can view log files, located in /websocket/logs/, that contain a user's cookie values and the predefined developer's cookie value.

How urgent is CVE-2020-29666?

Priority 42/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-29667 CRITICAL 9.8 DOWNGRADE In Lan ATMService M3 ATM Monitoring System 6.1.0, a remote attacker able to use a default cookie value, such a

References

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