CVE-2020-7233: KMS Controls BAC-A1616BC BACnet devices have a cleartext password of snowman in the BACKDOOR_NAME variable in

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CRITICAL 9.8REMOTEMITIGATE

CVE-2020-7233 is a critical-severity flaw (CVSS 9.8) affecting bac-a1616bc firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KMS Controls BAC-A1616BC BACnet devices have a cleartext password of snowman in the BACKDOOR_NAME variable in the BC_Logon.swf file.

Why this priority

Critical severity
Public exploit reference
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	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-522
Published	2020-01-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kmccontrols

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

Am I affected?

Timeline

2020-01-19 20:15 UTCPublished CVE record published
2026-06-17 03:24 UTCUpdated Record last modified

kmccontrols bac-a1616bc firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

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.

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-2020-7233?

bac-a1616bc firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7233 being exploited?

CVE-2020-7233 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-2020-7233 affect?

CVE-2020-7233 affects bac-a1616bc firmware. Severity is critical (CVSS 9.8). KMS Controls BAC-A1616BC BACnet devices have a cleartext password of snowman in the BACKDOOR_NAME variable in the BC_Logon.swf file.

How urgent is CVE-2020-7233?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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