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Vulnerability record · CVE-2011-0228 · published 29 August 2011

CVE-2011-0228: Apple iphone os improper input validation vulnerability

Apple · Iphone Os

The Data Security component in Apple iOS before 4.2.10 and 4.3.x before 4.3.5 does not check the basicConstraints parameter during validation of X.509 certificate chains, which allows man-in-the-middle attackers to spoof an SSL server by using a non-CA certificate to sign a certificate for an arbitrary domain.

7.5 CVSS 2.0 High EPSS 6.5% · top 6.4% CWE-20 · Improper input validation
7.5CVSS 2.0 base score
6.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

The Data Security component in Apple iOS before 4.2.10 and 4.3.x before 4.3.5 does not check the basicConstraints parameter during validation of X.509 certificate chains, which allows man-in-the-middle attackers to spoof an SSL server by using a non-CA certificate to sign a certificate for an arbitrary domain.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.apple.com/archives/security-announce/2011//Jul/msg00004.html Vendor Advisory
http://lists.apple.com/archives/security-announce/2011//Jul/msg00005.html Vendor Advisory
http://secunia.com/advisories/45369 Vendor Advisory
http://securityreason.com/securityalert/8361
http://securitytracker.com/id?1025837
http://support.apple.com/kb/HT4824
http://support.apple.com/kb/HT4825 Vendor Advisory
http://www.securityfocus.com/archive/1/518982/100/0/threaded
http://www.securityfocus.com/bid/48877
https://www.trustwave.com/spiderlabs/advisories/TWSL2011-007.txt
http://lists.apple.com/archives/security-announce/2011//Jul/msg00004.html Vendor Advisory
http://lists.apple.com/archives/security-announce/2011//Jul/msg00005.html Vendor Advisory
http://secunia.com/advisories/45369 Vendor Advisory
http://securityreason.com/securityalert/8361
http://securitytracker.com/id?1025837
http://support.apple.com/kb/HT4824
http://support.apple.com/kb/HT4825 Vendor Advisory
http://www.securityfocus.com/archive/1/518982/100/0/threaded
http://www.securityfocus.com/bid/48877
https://www.trustwave.com/spiderlabs/advisories/TWSL2011-007.txt

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-0228), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.