Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs
Published Mar 24, 2019
6.5
MEDIUMCVSS 3.0
EPSS 1.83%
Description
Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.
Affected products
No data.
- ≤ 4.35.3
- ≤ 1.23.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.83% (0.01834) | 78.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.83% (0.01834) | 76.06th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.08% (0.00081) | 35.17th | v3 (v2023.03.01) |
| Jan 27, 2024 | 0.08% (0.00081) | 33.72th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.09% (0.00086) | 35.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00096) | 38.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.56% (0.02561) | 61.74th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v5 (v2026.06.15) |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Sep 1, 2021 | 0.62% (0.00624) | 45.04th | v1 |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
No CWE recorded.
References (2)
- http://www.securityfocus.com/bid/107550 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/107550 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.