CVE-2006-0538: CipherTrust IronMail 5.0.1, when "Denial of Service Protection" is enabled, allows remote attackers to cause a

Q: How do I fix CVE-2006-0538?

ironmail: upgrade to newer than 5.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2006-0538 being exploited?

CVE-2006-0538 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-2006-0538 affect?

CVE-2006-0538 affects ironmail. Severity is low (CVSS 2.6). CipherTrust IronMail 5.0.1, when "Denial of Service Protection" is enabled, allows remote attackers to cause a denial of service (possibly CPU consumption) via a SYN flood with malformed TCP packets from multiple connections.

Q: How urgent is CVE-2006-0538?

Priority 30/100. No elevated risk signals yet.

Routine

LOW 2.6UPGRADE

CVE-2006-0538 is a low-severity flaw (CVSS 2.6) affecting ironmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CipherTrust IronMail 5.0.1, when "Denial of Service Protection" is enabled, allows remote attackers to cause a denial of service (possibly CPU consumption) via a SYN flood with malformed TCP packets from multiple connections.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.6 (Low)
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Published	2006-02-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ciphertrust

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

Am I affected?

Timeline

2006-02-04 00:06 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

ciphertrust ironmail UPGRADE

Affected: <= 5.0.1

Fixed in: newer than 5.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 5.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ironmail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ironmail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2006-0538?

ironmail: upgrade to newer than 5.0.1. Exact commands for each OS are on this page.

Is CVE-2006-0538 being exploited?

CVE-2006-0538 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-2006-0538 affect?

CVE-2006-0538 affects ironmail. Severity is low (CVSS 2.6). CipherTrust IronMail 5.0.1, when "Denial of Service Protection" is enabled, allows remote attackers to cause a denial of service (possibly CPU consumption) via a SYN flood with malformed TCP packets from multiple connections.

How urgent is CVE-2006-0538?

Priority 30/100. No elevated risk signals yet.

Related CVEs

CVE-2007-1723 MEDIUM 6.8 DOWNGRADE Multiple cross-site scripting (XSS) vulnerabilities in the administration console in Secure Computing CipherTr
CVE-2006-5210 MEDIUM 5.0 UPGRADE Directory traversal vulnerability in IronWebMail before 6.1.1 HotFix-17 allows remote attackers to read arbitr

References

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