The arc4random function in the kernel in FreeBSD 6.3 through 7.1 does not have a proper entropy source for a short time period immediately after boot, which makes it easier for attackers to predict the function's return values and conduct certain attacks against the GEOM framework and various network protocols, related to the Yarrow random number generator
Published Nov 26, 2008
7.0
HIGHCVSS 3.1
EPSS 0.32%
Description
The arc4random function in the kernel in FreeBSD 6.3 through 7.1 does not have a proper entropy source for a short time period immediately after boot, which makes it easier for attackers to predict the function's return values and conduct certain attacks against the GEOM framework and various network protocols, related to the Yarrow random number generator.
Affected products
No data.
- ≥ 6.4 · < 7.0
- 6.3
- 6.3
- 6.3
- 6.3
- 6.3
- 6.3
- 7.0
- 7.0
- 7.0
- 7.0
- 7.0
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
- 7.1
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.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:C/I:C/A:C
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.32% (0.00319) | 22.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.32% (0.00319) | 23.35th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.06% (0.00063) | 16.78th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00062) | 28.60th | v3 (v2023.03.01) |
| May 18, 2024 | 0.06% (0.00062) | 26.22th | v3 (v2023.03.01) |
| Feb 15, 2024 | 0.06% (0.00062) | 24.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00052) | 18.57th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.95% (0.00950) | 30.63th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
References (5)
- http://osvdb.org/50137 vdb-entryx_refsource_OSVDBBroken Link
- http://secunia.com/advisories/32871 third-party-advisoryx_refsource_SECUNIABroken Link
- http://security.freebsd.org/advisories/FreeBSD-SA-08:11.arc4random.asc vendor-advisoryx_refsource_FREEBSDVendor Advisory
- http://securitytracker.com/id?1021276 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/32447 vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://osvdb.org/50137 | vdb-entryx_refsource_OSVDBBroken Link | |
| http://secunia.com/advisories/32871 | third-party-advisoryx_refsource_SECUNIABroken Link | |
| http://security.freebsd.org/advisories/FreeBSD-SA-08:11.arc4random.asc | vendor-advisoryx_refsource_FREEBSDVendor Advisory | |
| http://securitytracker.com/id?1021276 | vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry | |
| http://www.securityfocus.com/bid/32447 | vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.