How severe is CVE-2001-1581?

CVE-2001-1581 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-1581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1581?

CVE-2001-1581 affects Clearswift Limited Mailsweeper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-1581 published?

CVE-2001-1581 was published on 2001-12-31 and last updated on 2026-06-16.

CVE-2001-1581

CVE-2001-1581 is a high-severity vulnerability in Clearswift Limited Mailsweeper with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Clearswift Limited Mailsweeper
Published: 2001-12-31
Last modified: 2026-06-16

Description

The File Blocker feature in Clearswift MAILsweeper for SMTP 4.2 allows remote attackers to bypass e-mail attachment filtering policies via a modified name in a Content-Type header.

Frequently asked questions

What is CVE-2001-1581?: The File Blocker feature in Clearswift MAILsweeper for SMTP 4.2 allows remote attackers to bypass e-mail attachment filtering policies via a modified name in a Content-Type header.
How severe is CVE-2001-1581?: CVE-2001-1581 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-1581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1581?: CVE-2001-1581 affects Clearswift Limited Mailsweeper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-1581 published?: CVE-2001-1581 was published on 2001-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:clearswift_limited:mailsweeper:4.2:*:*:*:*:*:*:*

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