CVE-2006-3216: Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attacke

Q: How do I fix CVE-2006-3216?

mailsweeper for exchange: upgrade to newer than 4.3.19; mailsweeper for smtp: upgrade to newer than 4.3.19. Exact commands for each OS are on this page.

Q: Is CVE-2006-3216 being exploited?

CVE-2006-3216 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-2006-3216 affect?

CVE-2006-3216 affects mailsweeper for exchange, mailsweeper for smtp. Severity is medium (CVSS 5.0). Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to

Q: How urgent is CVE-2006-3216?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADEUPGRADE

CVE-2006-3216 is a medium-severity flaw (CVSS 5.0) affecting mailsweeper for exchange, mailsweeper for smtp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Published	2006-06-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: clearswift

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

Am I affected?

Timeline

2006-06-24 01:06 UTCPublished CVE record published
2026-06-16 22:26 UTCUpdated Record last modified

clearswift mailsweeper for exchange UPGRADE

Affected: <= 4.3.19

Fixed in: newer than 4.3.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailsweeper-for-exchange || rpm -q mailsweeper-for-exchange || mailsweeper-for-exchange --version

2. UPGRADE to newer than 4.3.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailsweeper-for-exchange

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailsweeper-for-exchange

Note

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

clearswift mailsweeper for smtp UPGRADE

Affected: <= 4.3.19

Fixed in: newer than 4.3.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailsweeper-for-smtp || rpm -q mailsweeper-for-smtp || mailsweeper-for-smtp --version

2. UPGRADE to newer than 4.3.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailsweeper-for-smtp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailsweeper-for-smtp

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-2006-3216?

mailsweeper for exchange: upgrade to newer than 4.3.19; mailsweeper for smtp: upgrade to newer than 4.3.19. Exact commands for each OS are on this page.

Is CVE-2006-3216 being exploited?

CVE-2006-3216 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-2006-3216 affect?

CVE-2006-3216 affects mailsweeper for exchange, mailsweeper for smtp. Severity is medium (CVSS 5.0). Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to

How urgent is CVE-2006-3216?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2006-3215 HIGH 7.5 UPGRADE UPGRADE Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attacke

References

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