CVE-2015-6997
The X.509 certificate-trust implementation in Apple iOS before 9.1 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints…
Does this matter?
Lower severity and a low EPSS score (0.90%). Track it; it rarely justifies an emergency change on its own.
Description
The X.509 certificate-trust implementation in Apple iOS before 9.1 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.
- CVSS 2.0
- 4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
- EPSS
- 0.90% probability · 60th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-254
- Affected
- apple/iphone os · apple/watchos
- Source
- product-security@apple.com
EPSS 0.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.apple.com/archives/security-announce/2015/Dec/msg00002.htmlVendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.htmlVendor Advisory
- http://www.securityfocus.com/bid/77268
- http://www.securitytracker.com/id/1033929
- https://support.apple.com/HT205370Vendor Advisory
- https://support.apple.com/HT205641Vendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Dec/msg00002.htmlVendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.htmlVendor Advisory
- http://www.securityfocus.com/bid/77268
- http://www.securitytracker.com/id/1033929
- https://support.apple.com/HT205370Vendor Advisory
- https://support.apple.com/HT205641Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.