How severe is CVE-2003-0121?

CVE-2003-0121 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2003-0121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0121?

CVE-2003-0121 primarily affects Clearswift Mailsweeper. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0121?

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-2003-0121 published?

CVE-2003-0121 was published on 2003-03-18 and last updated on 2026-06-16.

CVE-2003-0121

CVE-2003-0121 is a high-severity vulnerability in Clearswift 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: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Clearswift Mailsweeper
Published: 2003-03-18
Last modified: 2026-06-16

Description

Clearswift MAILsweeper 4.x allows remote attackers to bypass attachment detection via an attachment that does not specify a MIME-Version header field, which is processed by some mail clients.

Frequently asked questions

What is CVE-2003-0121?: Clearswift MAILsweeper 4.x allows remote attackers to bypass attachment detection via an attachment that does not specify a MIME-Version header field, which is processed by some mail clients.
How severe is CVE-2003-0121?: CVE-2003-0121 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-0121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0121?: CVE-2003-0121 primarily affects Clearswift Mailsweeper. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0121?: 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-2003-0121 published?: CVE-2003-0121 was published on 2003-03-18 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:clearswift:mailsweeper:4.0:*:*:*:*:*:*:*
cpe:2.3:a:clearswift:mailsweeper:4.1:*:*:*:*:*:*:*
cpe:2.3:a:clearswift:mailsweeper:4.2:*:*:*:*:*:*:*
cpe:2.3:a:clearswift:mailsweeper:4.3:*:*:*:*:*:*:*

More vulnerabilities in Clearswift Mailsweeper

CVE-2004-0234 — Critical (CVSS 10.0): Multiple stack-based buffer overflows in the get_header function in header.c for LHA 1.14, as used in products such as…
CVE-2004-0161 — High (CVSS 7.5): Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME…
CVE-2003-1016 — High (CVSS 7.5): Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME…
CVE-2004-0051 — High (CVSS 7.5): Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME…
CVE-2004-0162 — High (CVSS 7.5): Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME…
CVE-2004-0053 — High (CVSS 7.5): Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME…

All CVEs affecting Clearswift Mailsweeper →