How severe is CVE-2001-1421?

CVE-2001-1421 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-1421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1421?

CVE-2001-1421 affects Aol Instant Messenger. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1421?

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

When was CVE-2001-1421 published?

CVE-2001-1421 was published on 2001-10-06 and last updated on 2026-06-16.

CVE-2001-1421

CVE-2001-1421 is a medium-severity vulnerability in Aol Instant Messenger 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: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Aol Instant Messenger
Published: 2001-10-06
Last modified: 2026-06-16

Description

AOL Instant Messenger (AIM) 4.7 and earlier allows remote attackers to cause a denial of service (application crash) via a large number of different fonts followed by an HTML HR tag.

Frequently asked questions

What is CVE-2001-1421?: AOL Instant Messenger (AIM) 4.7 and earlier allows remote attackers to cause a denial of service (application crash) via a large number of different fonts followed by an HTML HR tag.
How severe is CVE-2001-1421?: CVE-2001-1421 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-1421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1421?: CVE-2001-1421 affects Aol Instant Messenger. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-1421 published?: CVE-2001-1421 was published on 2001-10-06 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:aol:instant_messenger:*:*:*:*:*:*:*:*

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