MEDIUM
In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain
Published Jan 11, 2019
6.5
MEDIUMCVSS 3.0
EPSS 1.33%
Description
In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.5 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact None
4.0 MEDIUM NVD
AV:N/AC:L/Au:S/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication Single
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.33% 0.01332
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01332
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.33% (0.01332) | 70.08th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.33% (0.01332) | 67.32th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.59% (0.00592) | 67.36th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.11% (0.00112) | 46.20th | v3 (v2023.03.01) |
| Jan 5, 2024 | 0.11% (0.00112) | 44.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00122) | 44.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00890) | 28.64th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00890) | 26.62th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00890) | 12.04th | v2 (v2022.01.01) |
Weaknesses (1)
References (3)
- https://support.apple.com/HT206902 x_refsource_MISCVendor Advisory
- https://support.apple.com/HT206903 x_refsource_MISCVendor Advisory
- https://support.apple.com/HT206905 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://support.apple.com/HT206902 | x_refsource_MISCVendor Advisory | |
| https://support.apple.com/HT206903 | x_refsource_MISCVendor Advisory | |
| https://support.apple.com/HT206905 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apple
Published Jan 11, 2019
Updated Aug 6, 2024
Reserved May 11, 2016
Link CVE-2016-4644
CISA Vulnrichment
Updated n/a