MEDIUM
isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd acts as a responder during SA negotiation, which allows remote attackers to replay IPSec packets and bypass the replay protection
Published Aug 29, 2006
5.0
MEDIUMCVSS 2.0
EPSS 1.83%
Description
isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd acts as a responder during SA negotiation, which allows remote attackers to replay IPSec packets and bypass the replay protection.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.83% 0.01832
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.01832
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 2, 2026 | 1.83% (0.01832) | 78.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.74% (0.01738) | 74.67th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.63% (0.00632) | 68.58th | v4 (v2025.03.14) |
| Dec 18, 2024 | 0.71% (0.00707) | 80.20th | v3 (v2023.03.01) |
| Dec 17, 2024 | 13.76% (0.13756) | 95.61th | v3 (v2023.03.01) |
| Jul 19, 2024 | 9.35% (0.09353) | 94.76th | v3 (v2023.03.01) |
| Oct 24, 2023 | 22.08% (0.22077) | 95.91th | v3 (v2023.03.01) |
| Aug 9, 2023 | 23.48% (0.23485) | 95.93th | v3 (v2023.03.01) |
| Jul 2, 2023 | 6.56% (0.06559) | 92.72th | v3 (v2023.03.01) |
| May 25, 2023 | 2.88% (0.02882) | 89.25th | v3 (v2023.03.01) |
| Apr 17, 2023 | 1.51% (0.01514) | 85.00th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.79% (0.00793) | 78.90th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.97% (0.01974) | 78.97th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.97% (0.01974) | 77.12th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.97% (0.01974) | 56.20th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (9)
- http://secunia.com/advisories/21652 third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
- http://secunia.com/advisories/21905 third-party-advisoryx_refsource_SECUNIA
- http://securitytracker.com/id?1016757 vdb-entryx_refsource_SECTRACKPatch
- http://www.debian.org/security/2006/dsa-1175 vendor-advisoryx_refsource_DEBIAN
- http://www.openbsd.org/errata.html#isakmpd vendor-advisoryx_refsource_OPENBSD
- http://www.openbsd.org/errata38.html#isakmpd vendor-advisoryx_refsource_OPENBSD
- http://www.osvdb.org/28194 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/19712 vdb-entryx_refsource_BIDPatch
- https://exchange.xforce.ibmcloud.com/vulnerabilities/28645 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/21652 | third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory | |
| http://secunia.com/advisories/21905 | third-party-advisoryx_refsource_SECUNIA | |
| http://securitytracker.com/id?1016757 | vdb-entryx_refsource_SECTRACKPatch | |
| http://www.debian.org/security/2006/dsa-1175 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openbsd.org/errata.html#isakmpd | vendor-advisoryx_refsource_OPENBSD | |
| http://www.openbsd.org/errata38.html#isakmpd | vendor-advisoryx_refsource_OPENBSD | |
| http://www.osvdb.org/28194 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/19712 | vdb-entryx_refsource_BIDPatch | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/28645 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Aug 29, 2006
Updated Aug 7, 2024
Reserved Aug 28, 2006
Link CVE-2006-4436
CISA Vulnrichment
Updated n/a