How severe is CVE-2009-3455?

CVE-2009-3455 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-3455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3455?

CVE-2009-3455 primarily affects Apple Safari. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3455?

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-2009-3455 published?

CVE-2009-3455 was published on 2009-09-29 and last updated on 2026-06-16.

CVE-2009-3455

CVE-2009-3455 is a high-severity vulnerability in Apple Safari 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. The underlying weakness is classified as CWE-310.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Apple Safari
Published: 2009-09-29
Last modified: 2026-06-16

Description

Apple Safari, possibly before 4.0.3, on Mac OS X does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Frequently asked questions

What is CVE-2009-3455?: Apple Safari, possibly before 4.0.3, on Mac OS X does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
How severe is CVE-2009-3455?: CVE-2009-3455 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-3455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3455?: CVE-2009-3455 primarily affects Apple Safari. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3455?: 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-2009-3455 published?: CVE-2009-3455 was published on 2009-09-29 and last updated on 2026-06-16.

References

Affected products (48)

cpe:2.3:a:apple:safari:*:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:0.8:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:0.9:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.0.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.0b1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.4:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2.5:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.4:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.3:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.4:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.4:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.1:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.2:*:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2.1:*:mac:*:*:*:*:*

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