MEDIUM
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
Published Sep 18, 2015
5.0
MEDIUMCVSS 2.0
EPSS 2.44%
Description
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
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
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.44% 0.02440
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02440
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.44% (0.02440) | 83.72th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.44% (0.02440) | 82.12th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.01% (0.01009) | 75.53th | v4 (v2025.03.14) |
| Dec 12, 2024 | 5.37% (0.05373) | 93.41th | v3 (v2023.03.01) |
| Mar 7, 2023 | 5.37% (0.05373) | 91.89th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
Weaknesses (1)
References (6)
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html vendor-advisoryx_refsource_APPLEVendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html vendor-advisoryx_refsource_APPLEVendor Advisory
- http://www.securityfocus.com/bid/76764 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1033609 vdb-entryx_refsource_SECTRACK
- https://support.apple.com/HT205212 x_refsource_CONFIRMVendor Advisory
- https://support.apple.com/HT205267 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html | vendor-advisoryx_refsource_APPLEVendor Advisory | |
| http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html | vendor-advisoryx_refsource_APPLEVendor Advisory | |
| http://www.securityfocus.com/bid/76764 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1033609 | vdb-entryx_refsource_SECTRACK | |
| https://support.apple.com/HT205212 | x_refsource_CONFIRMVendor Advisory | |
| https://support.apple.com/HT205267 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apple
Published Sep 18, 2015
Updated Aug 6, 2024
Reserved Aug 6, 2015
Link CVE-2015-5879
CISA Vulnrichment
Updated n/a