Vulnerability in Signal
CVE-2018-9840
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 · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
References
- github.com/signalapp/Signal-iOS/commit/018a35df7b42b4941cb4dfc9f462b37c3fafd9e9 (Patch, Third Party Advisory)
- github.com/signalapp/Signal-iOS/commits/release/2.23.2 (Patch, Third Party Advisory, Issue Tracking)
- nint.en.do/Signal-Bypass-Screen-locker.php (Third Party Advisory, Broken Link)
Frequently asked questions
- What is CVE-2018-9840?
- CVE-2018-9840 is a medium-severity vulnerability in Signal. CVSS score: 6.8/10. Published 2018-04-10.
- How severe is CVE-2018-9840?
- Medium severity. CVSS v3 base score is 6.8 out of 10.