CVE-2004-2703: Clearswift MIMEsweeper 5.0.5, when it has been upgraded from MAILsweeper for SMTP version 4.3 or MAILsweeper B

Routine

MEDIUM 4.3MITIGATEMITIGATEDOWNGRADE

CVE-2004-2703 is a medium-severity flaw (CVSS 4.3) affecting mailsweeper business suite i, mailsweeper business suite ii, mailsweeper for smtp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Clearswift MIMEsweeper 5.0.5, when it has been upgraded from MAILsweeper for SMTP version 4.3 or MAILsweeper Business Suite I or II, allows remote attackers to bypass scanning by including encrypted data in a mail message, which causes the message to be marked as "Clean" instead of "Encrypted".

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-310
Published	2004-12-31
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

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

clearswift mailsweeper business suite i MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailsweeper-business-suite-i || rpm -q mailsweeper-business-suite-i || mailsweeper-business-suite-i --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

clearswift mailsweeper business suite ii MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailsweeper-business-suite-ii || rpm -q mailsweeper-business-suite-ii || mailsweeper-business-suite-ii --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

clearswift mailsweeper for smtp DOWNGRADE

Affected: 4.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.3 (Debian / Ubuntu)

apt-cache madison mailsweeper-for-smtp sudo apt install mailsweeper-for-smtp=<VERSION_BEFORE_4.3> sudo apt-mark hold mailsweeper-for-smtp

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

dnf --showduplicates list mailsweeper-for-smtp sudo dnf downgrade mailsweeper-for-smtp-<VERSION_BEFORE_4.3> sudo dnf versionlock add mailsweeper-for-smtp

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.

clearswift mimesweeper for web DOWNGRADE

Affected: 5.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.5

1. Check installed version

apt-cache policy mimesweeper-for-web || rpm -q mimesweeper-for-web || mimesweeper-for-web --version

2. No fixed release: DOWNGRADE to a release before 5.0.5 (Debian / Ubuntu)

apt-cache madison mimesweeper-for-web sudo apt install mimesweeper-for-web=<VERSION_BEFORE_5.0.5> sudo apt-mark hold mimesweeper-for-web

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

dnf --showduplicates list mimesweeper-for-web sudo dnf downgrade mimesweeper-for-web-<VERSION_BEFORE_5.0.5> sudo dnf versionlock add mimesweeper-for-web

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-2004-2703?

mailsweeper business suite i: mitigate or apply the listed mitigation; mailsweeper business suite ii: mitigate or apply the listed mitigation; mailsweeper for smtp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2703 being exploited?

CVE-2004-2703 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-2004-2703 affect?

CVE-2004-2703 affects mailsweeper business suite i, mailsweeper business suite ii, mailsweeper for smtp. Severity is medium (CVSS 4.3). Clearswift MIMEsweeper 5.0.5, when it has been upgraded from MAILsweeper for SMTP version 4.3 or MAILsweeper Business Suite I or II, allows remote attackers to bypass scanning by including encrypted data in a mail message, which causes the

How urgent is CVE-2004-2703?

Priority 32/100. No elevated risk signals yet.

References

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