How severe is CVE-2001-0631?

CVE-2001-0631 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-0631 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0631?

CVE-2001-0631 affects Opentext Firstclass. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0631?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-0631 published?

CVE-2001-0631 was published on 2001-08-22 and last updated on 2026-06-16.

CVE-2001-0631

CVE-2001-0631 is a medium-severity vulnerability in Opentext Firstclass with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Opentext Firstclass
Published: 2001-08-22
Last modified: 2026-06-16

Description

Centrinity First Class Internet Services 5.50 allows for the circumventing of the default 'spam' filters via the presence of '<@>' in the 'From:' field, which allows remote attackers to send spoofed email with the identity of local users.

Frequently asked questions

What is CVE-2001-0631?: Centrinity First Class Internet Services 5.50 allows for the circumventing of the default 'spam' filters via the presence of '<@>' in the 'From:' field, which allows remote attackers to send spoofed email with the identity of local users.
How severe is CVE-2001-0631?: CVE-2001-0631 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-0631 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0631?: CVE-2001-0631 affects Opentext Firstclass. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0631?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0631 published?: CVE-2001-0631 was published on 2001-08-22 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:opentext:firstclass:5.50:*:*:*:*:*:*:*

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