sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password
Published Feb 19, 2022
7.5
HIGHCVSS 3.1
EPSS 2.23%
Description
sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password.
Affected products
No data.
- ≤ 0.6
- ≤ 0.6
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.23% (0.02234) | 82.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.20% (0.02200) | 80.13th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.18% (0.00184) | 37.93th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.20% (0.00204) | 59.34th | v3 (v2023.03.01) |
| May 13, 2024 | 0.15% (0.00154) | 51.39th | v3 (v2023.03.01) |
| Oct 10, 2023 | 0.12% (0.00119) | 45.50th | v3 (v2023.03.01) |
| Sep 26, 2023 | 0.10% (0.00099) | 40.48th | v3 (v2023.03.01) |
| Aug 1, 2023 | 0.08% (0.00079) | 32.72th | v3 (v2023.03.01) |
| Mar 23, 2023 | 0.07% (0.00071) | 28.90th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00063) | 25.40th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Sep 2, 2022 | 0.95% (0.00954) | 34.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Mar 1, 2022 | 0.95% (0.00954) | 17.01th | v2 (v2022.01.01) |
| Feb 19, 2022 | 0.89% (0.00890) | 12.64th | v2 (v2022.01.01) |
References (3)
- https://akkadia.org/drepper/SHA-crypt.txt x_refsource_MISCExploitThird Party Advisory
- https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/ x_refsource_MISCExploitThird Party Advisory
- https://twitter.com/solardiz/status/795601240151457793 x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://akkadia.org/drepper/SHA-crypt.txt | x_refsource_MISCExploitThird Party Advisory | |
| https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/ | x_refsource_MISCExploitThird Party Advisory | |
| https://twitter.com/solardiz/status/795601240151457793 | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.