CVE-2006-4037: Unspecified vulnerability in Fenestrae Faxination Server allows remote attackers to execute arbitrary code via

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HIGH 10.0DOWNGRADE

CVE-2006-4037 is a high-severity flaw (CVSS 10.0) affecting faxination server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in Fenestrae Faxination Server allows remote attackers to execute arbitrary code via a crafted packet.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	5.2% (top 8%)
CISA exploited list	No
Published	2006-08-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fenestrae

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

Am I affected?

Timeline

2006-08-09 22:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

fenestrae faxination server DOWNGRADE

Affected: 4.0 · 5.0 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy faxination-server || rpm -q faxination-server || faxination-server --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison faxination-server sudo apt install faxination-server=<VERSION_BEFORE_4.0> sudo apt-mark hold faxination-server

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

dnf --showduplicates list faxination-server sudo dnf downgrade faxination-server-<VERSION_BEFORE_4.0> sudo dnf versionlock add faxination-server

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-2006-4037?

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

Is CVE-2006-4037 being exploited?

CVE-2006-4037 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-2006-4037 affect?

CVE-2006-4037 affects faxination server. Severity is high (CVSS 10.0). Unspecified vulnerability in Fenestrae Faxination Server allows remote attackers to execute arbitrary code via a crafted packet.

How urgent is CVE-2006-4037?

Priority 58/100. Critical severity; EPSS top 8%: very likely to be exploited

References

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