MEDIUM
The Open Whisper Signal app before 2.23.2 for iOS allows physically proximate attackers to bypass the screen locker feature via certain rapid sequences of actions that include app opening, clicking on cancel, and using the home button
Published Apr 10, 2018
6.8
MEDIUMCVSS 3.0
EPSS 0.42%
Description
The Open Whisper Signal app before 2.23.2 for iOS allows physically proximate attackers to bypass the screen locker feature via certain rapid sequences of actions that include app opening, clicking on cancel, and using the home button.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.8 MEDIUM NVD
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Physical
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
4.6 MEDIUM NVD
AV:L/AC:L/Au:N/C:P/I:P/A:P
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
0.42% 0.00417
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00417
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.42% (0.00417) | 33.71th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.42% (0.00417) | 35.70th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.15% (0.00147) | 51.23th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.15% (0.00147) | 50.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00124) | 45.03th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
Weaknesses (0)
No CWE recorded.
References (3)
- http://nint.en.do/Signal-Bypass-Screen-locker.php x_refsource_MISCBroken LinkThird Party Advisory
- https://github.com/signalapp/Signal-iOS/commit/018a35df7b42b4941cb4dfc9f462b37c3fafd9e9 x_refsource_MISCPatchThird Party Advisory
- https://github.com/signalapp/Signal-iOS/commits/release/2.23.2 x_refsource_MISCIssue TrackingPatchThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://nint.en.do/Signal-Bypass-Screen-locker.php | x_refsource_MISCBroken LinkThird Party Advisory | |
| https://github.com/signalapp/Signal-iOS/commit/018a35df7b42b4941cb4dfc9f462b37c3fafd9e9 | x_refsource_MISCPatchThird Party Advisory | |
| https://github.com/signalapp/Signal-iOS/commits/release/2.23.2 | x_refsource_MISCIssue TrackingPatchThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Apr 10, 2018
Updated Aug 5, 2024
Reserved Apr 7, 2018
Link CVE-2018-9840
CISA Vulnrichment
Updated n/a