CVE-2009-3455: n/a vulnerability

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...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 19:36 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-3455 is a Safari certificate-validation flaw on Mac OS X. Safari could mis-handle a null character in a certificate domain name, letting a network attacker impersonate HTTPS sites if they had a specially crafted certificate from a legitimate CA. Exposure appears limited to legacy Mac OS X systems running affected Safari versions, possibly before 4.0.3. The source bundle does not provide exact CPEs, supported-platform details, or a confirmed fixed version. Treat this as a legacy-client exposure issue. It is not a current mass-exploitation signal in the provided sources, but vulnerable systems could undermine HTTPS trust on hostile networks. Mitigation focus: Check Apple guidance for the confirmed fixed Safari and Mac OS X versions.; Retire or isolate systems running legacy Safari on Mac OS X.; Use modern browsers with current certificate validation behavior..

Prepared: Jun 28, 2026, 18:15 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 29, 2009, 17:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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