CVE-2011-3253

CVE-2011-3253 is a low-severity vulnerability in Apple Iphone Os with a CVSS 2.0 base score of 2.6. 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-200.

Key facts

Description

CalDAV in Apple iOS before 5 does not validate X.509 certificates for SSL sessions, which allows man-in-the-middle attackers to spoof calendar servers and obtain sensitive information via an arbitrary certificate.

Frequently asked questions

What is CVE-2011-3253?
CalDAV in Apple iOS before 5 does not validate X.509 certificates for SSL sessions, which allows man-in-the-middle attackers to spoof calendar servers and obtain sensitive information via an arbitrary certificate.
How severe is CVE-2011-3253?
CVE-2011-3253 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-2011-3253 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-2011-3253?
CVE-2011-3253 primarily affects Apple Iphone Os. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-3253?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-3253 published?
CVE-2011-3253 was published on 2011-10-14 and last updated on 2026-06-16.

References

Affected products (29)

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