CVE-2005-4526: Clearswift MIMEsweeper For Web (a.k.a

This month

MEDIUM 5.0DOWNGRADE

CVE-2005-4526 is a medium-severity flaw (CVSS 5.0) affecting mimesweeper for web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Clearswift MIMEsweeper For Web (a.k.a. WEBsweeper) 4.0 through 5.1 allows remote attackers to bypass filtering via a URL that does not include a .exe extension but returns an executable file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2005-12-28
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

2005-12-28 01:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

clearswift mimesweeper for web DOWNGRADE

Affected: 4.0 · 5.0.1 · 5.0.2 · 5.0.3 · 5.0.4 · 5.0.5 · 5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

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 4.0 (Debian / Ubuntu)

apt-cache madison mimesweeper-for-web sudo apt install mimesweeper-for-web=<VERSION_BEFORE_4.0> 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_4.0> 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-2005-4526?

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

Is CVE-2005-4526 being exploited?

CVE-2005-4526 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-2005-4526 affect?

CVE-2005-4526 affects mimesweeper for web. Severity is medium (CVSS 5.0). Clearswift MIMEsweeper For Web (a.k.a. WEBsweeper) 4.0 through 5.1 allows remote attackers to bypass filtering via a URL that does not include a .exe extension but returns an executable file.

How urgent is CVE-2005-4526?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2006-3523 MEDIUM 5.0 UPGRADE Clearswift MIMEsweeper for Web before 5.1.15 Hotfix allows remote attackers to cause a denial of service (cras
CVE-2006-3522 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in Clearswift MIMEsweeper for Web before 5.1.15 Hotfix allows remote
CVE-2004-2703 MEDIUM 4.3 MITIGATE MITIGATE Clearswift MIMEsweeper 5.0.5, when it has been upgraded from MAILsweeper for SMTP version 4.3 or MAILsweeper B
CVE-2004-1715 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in MIMEsweeper for Web before 5.0.4 allows remote attackers or local users t

References

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