How severe is CVE-2001-0271?

CVE-2001-0271 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2001-0271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0271?

CVE-2001-0271 affects Mailnews.cgi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0271?

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

When was CVE-2001-0271 published?

CVE-2001-0271 was published on 2001-05-03 and last updated on 2026-06-16.

CVE-2001-0271

CVE-2001-0271 is a critical-severity vulnerability in Mailnews.cgi with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mailnews.cgi
Published: 2001-05-03
Last modified: 2026-06-16

Description

mailnews.cgi 1.3 and earlier allows remote attackers to execute arbitrary commands via a user name that contains shell metacharacters.

Frequently asked questions

What is CVE-2001-0271?: mailnews.cgi 1.3 and earlier allows remote attackers to execute arbitrary commands via a user name that contains shell metacharacters.
How severe is CVE-2001-0271?: CVE-2001-0271 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2001-0271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0271?: CVE-2001-0271 affects Mailnews.cgi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2001-0271 published?: CVE-2001-0271 was published on 2001-05-03 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mailnews.cgi:mailnews.cgi:*:*:*:*:*:*:*:*