CVE-2001-0276: ext.dll in BadBlue 1.02.07 Personal Edition web server allows remote attackers to determine the physical path

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MEDIUM 6.4DOWNGRADE

CVE-2001-0276 is a medium-severity flaw (CVSS 6.4) affecting badblue. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ext.dll in BadBlue 1.02.07 Personal Edition web server allows remote attackers to determine the physical path of the server by directly calling ext.dll without any arguments, which produces an error message that contains the path.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Published	2001-05-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: working resources inc.

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2001-05-03 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

working resources inc. badblue DOWNGRADE

Affected: 1.2.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.7

1. Check installed version

apt-cache policy badblue || rpm -q badblue || badblue --version

2. No fixed release: DOWNGRADE to a release before 1.2.7 (Debian / Ubuntu)

apt-cache madison badblue sudo apt install badblue=<VERSION_BEFORE_1.2.7> sudo apt-mark hold badblue

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

dnf --showduplicates list badblue sudo dnf downgrade badblue-<VERSION_BEFORE_1.2.7> sudo dnf versionlock add badblue

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.

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: Working Resources BadBlue 1.2.7 - Full Path Disclosure

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-2001-0276?

badblue: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0276 being exploited?

CVE-2001-0276 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-2001-0276 affect?

CVE-2001-0276 affects badblue. Severity is medium (CVSS 6.4). ext.dll in BadBlue 1.02.07 Personal Edition web server allows remote attackers to determine the physical path of the server by directly calling ext.dll without any arguments, which produces an error message that contains the path.

How urgent is CVE-2001-0276?

Priority 50/100. Public exploit reference

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References

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