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CVE-2011-3253

12
FAUCET Score

CVE-2011-3253 describes a vulnerability in Apple iOS before version 5, where the CalDAV client fails to validate X.509 certificates for SSL sessions. This flaw allows man-in-the-middle attackers to spoof calendar servers using arbitrary certificates, potentially leading to the disclosure of sensitive information. With a CVSS score of 2.6, this vulnerability has a network attack vector and high access complexity, resulting in a partial confidentiality impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:3.0:-:iphone:*:*:*:*:*
3.1CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:3.1:*:*:*:*:*:*:*
3.1CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:3.1:-:iphone:*:*:*:*:*
3.1CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:3.1:-:ipodtouch:*:*:*:*:*
3.1.2CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:3.1.2:-:iphone:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
43.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 28th percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

applevendor investigatingvia nvd_reference
View patch

References

lists.apple.com / archives/Security-announce/2011//Oct/msg00001.html
Vendor Advisory
support.apple.com / kb/HT4999
Vendor Advisory