openswan: denial of service via IKE daemon restart when receiving a bad DH gx value
Published Nov 9, 2015
4.3
MEDIUMCVSS 2.0
EPSS 2.79%
Description
The pluto IKE daemon in libreswan before 3.15 and Openswan before 2.6.45, when built with NSS, allows remote attackers to cause a denial of service (assertion failure and daemon restart) via a zero DH g^x value in a KE payload in a IKE packet.
Affected products
No data.
No data.
Red Hat Enterprise Linux 7
libreswan-0:3.15-5.ael7b_1
Fixed · RHSA-2015:1979
Red Hat Enterprise Linux 5
openswan
Will not fix
Red Hat Enterprise Linux 6
openswan
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | libreswan-0:3.15-5.ael7b_1 | Fixed | RHSA-2015:1979 |
| Red Hat Enterprise Linux 5 | openswan | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | openswan | Will not fix | n/a |
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.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/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 2, 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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.79% (0.02788) | 85.92th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.77% (0.02765) | 84.34th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.10% (0.01099) | 76.05th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.41% (0.02414) | 75.12th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.10% (0.01099) | 76.51th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.26% (0.03257) | 91.07th | v3 (v2023.03.01) |
| Feb 9, 2024 | 4.54% (0.04542) | 92.19th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.04% (0.06035) | 92.33th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.32% (0.01319) | 70.74th | v2 (v2022.01.01) |
| Feb 3, 2023 | 2.17% (0.02172) | 80.18th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (12)
- http://rhn.redhat.com/errata/RHSA-2015-1979.html vendor-advisoryx_refsource_REDHAT
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/77536 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1033418 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2015-3240 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1232320 Issue Tracking
- https://libreswan.org/security/CVE-2015-3240/
- https://libreswan.org/security/CVE-2015-3240/CVE-2015-3240.txt x_refsource_CONFIRMVendor Advisory
- https://lists.openswan.org/pipermail/users/2015-August/023401.html mailing-listx_refsource_MLISTVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-3240
- https://security.gentoo.org/glsa/201603-13 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-3240
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2015-1979.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html | x_refsource_CONFIRM | |
| http://www.securityfocus.com/bid/77536 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1033418 | vdb-entryx_refsource_SECTRACK | |
| https://access.redhat.com/security/cve/CVE-2015-3240 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1232320 | Issue Tracking | |
| https://libreswan.org/security/CVE-2015-3240/ | ||
| https://libreswan.org/security/CVE-2015-3240/CVE-2015-3240.txt | x_refsource_CONFIRMVendor Advisory | |
| https://lists.openswan.org/pipermail/users/2015-August/023401.html | mailing-listx_refsource_MLISTVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-3240 | ||
| https://security.gentoo.org/glsa/201603-13 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2015-3240 |
Change history (0)
No recorded changes yet.