A side-channel issue was discovered in Botan before 2.9.0
Published Mar 8, 2019
5.9
MEDIUMCVSS 3.0
EPSS 1.52%
Description
A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.
Affected products
No data.
- < 2.9.0
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:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/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 1, 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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.52% (0.01525) | 73.74th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.52% (0.01525) | 73.53th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.12% (0.00116) | 45.79th | v3 (v2023.03.01) |
| Mar 1, 2024 | 0.12% (0.00116) | 44.34th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00126) | 45.47th | 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 |
References (3)
- https://botan.randombit.net/news.html x_refsource_MISCRelease NotesVendor Advisory
- https://botan.randombit.net/security.html x_refsource_MISCVendor Advisory
- https://github.com/crocs-muni/ECTester x_refsource_MISCNot ApplicableThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://botan.randombit.net/news.html | x_refsource_MISCRelease NotesVendor Advisory | |
| https://botan.randombit.net/security.html | x_refsource_MISCVendor Advisory | |
| https://github.com/crocs-muni/ECTester | x_refsource_MISCNot ApplicableThird Party Advisory |
Change history (0)
No recorded changes yet.