How severe is CVE-2009-0321?

CVE-2009-0321 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-0321 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-2009-0321?

CVE-2009-0321 affects Apple Safari. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-0321?

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

When was CVE-2009-0321 published?

CVE-2009-0321 was published on 2009-01-28 and last updated on 2026-06-16.

CVE-2009-0321

CVE-2009-0321 is a medium-severity vulnerability in Apple Safari with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-59.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-59
Affected product: Apple Safari
Published: 2009-01-28
Last modified: 2026-06-16

Description

Apple Safari 3.2.1 (aka AppVer 3.525.27.1) on Windows allows remote attackers to cause a denial of service (infinite loop or access violation) via a link to an http URI in which the authority (aka hostname) portion is either a (1) . (dot) or (2) .. (dot dot) sequence.

Frequently asked questions

What is CVE-2009-0321?: Apple Safari 3.2.1 (aka AppVer 3.525.27.1) on Windows allows remote attackers to cause a denial of service (infinite loop or access violation) via a link to an http URI in which the authority (aka hostname) portion is either a (1) . (dot) or (2) .. (dot dot) sequence.
How severe is CVE-2009-0321?: CVE-2009-0321 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-0321 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-2009-0321?: CVE-2009-0321 affects Apple Safari. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-0321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0321 published?: CVE-2009-0321 was published on 2009-01-28 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:apple:safari:3.2.1:*:*:*:*:*:*:*

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