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CVE-2015-6997

16
FAUCET Score

CVE-2015-6997 is a vulnerability in Apple iOS before version 9.1 and watchOS that stems from a flaw in its X.509 certificate-trust implementation. The system fails to properly interpret the kSecRevocationRequirePositiveResponse flag, which should enforce revocation checking. This oversight allows man-in-the-middle attackers to spoof endpoints using revoked certificates, with a CVSS score of 4.3 indicating a medium attack complexity and potential for partial integrity impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 9.0.2CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
<= 2.0CPE matchmatch criteria
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
56.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 13th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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/2015/Dec/msg00002.html
Vendor Advisory
lists.apple.com / archives/security-announce/2015/Oct/msg00002.html
Vendor Advisory
support.apple.com / HT205370
Vendor Advisory
support.apple.com / HT205641
Vendor Advisory
securityfocus.com / bid/77268
securitytracker.com / id/1033929