Vulnerability Monitor

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CVE-2015-5879

XNU in the kernel in Apple iOS before 9 does not properly validate the headers of TCP packets, which allows remote attackers to bypass the sequence-number protection mechanism and cause a denial of service (TCP connection disruption) via a crafted header.

Security Impact Summary

CVE-2015-5879 is a security vulnerability that . Impacting 2 products from apple, from apple organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2015, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2015-09-18T12:00:18.653

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	apple	iphone_os	≤ 8.4.1	Yes
Operating System	apple	mac_os_x	≤ 10.10.5	Yes

References

http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html Vendor Advisory ([email protected])
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/76764 ([email protected])
http://www.securitytracker.com/id/1033609 ([email protected])
https://support.apple.com/HT205212 Vendor Advisory ([email protected])
https://support.apple.com/HT205267 Vendor Advisory ([email protected])
http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/76764 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1033609 (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT205212 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.apple.com/HT205267 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For apple's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.