Medium 4.0Published Nov 30, 2006

CVE-2006-4403The FTP server in Apple Mac OS X 10.4.8 and earlier, when FTP Access is enabled, will crash when a login failure occurs with a valid user name, which allows remote attackers to cause a denial of serv…

Updated under an hour ago (Nov 2, 2026, 12:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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The FTP server in Apple Mac OS X 10.4.8 and earlier, when FTP Access is enabled, will crash when a login failure occurs with a valid user name, which allows remote attackers to cause a denial of service (crash) and enumerate valid usernames.

CVSS: 4.0 MEDIUM (v2.0, NVD)AV:N/AC:H/Au:N/C:P/I:N/A:P
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apple mac_os_x apple:mac_os_x	through 10.4.8	NVD

References

References

http://docs.info.apple.com/article.html?artnum=304829
http://lists.apple.com/archives/security-announce/2006/Nov/msg00001.html
http://secunia.com/advisories/23155	vendor-advisory
http://securitytracker.com/id?1017303
http://www.kb.cert.org/vuls/id/371648	us-government-resource
http://www.osvdb.org/30734
http://www.securityfocus.com/bid/21335
http://www.us-cert.gov/cas/techalerts/TA06-333A.html	us-government-resource
http://www.vupen.com/english/advisories/2006/4750
https://exchange.xforce.ibmcloud.com/vulnerabilities/30621

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.