strongswan: Incorrect Handling of CHOICE types in ASN.1 parser and x509 plugin
Published Jun 8, 2017
7.5
HIGHCVSS 3.1
EPSS 2.22%
Description
The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allows remote attackers to cause a denial of service (infinite loop) via a crafted certificate.
Affected products
No data.
- ≤ 5.5.2
No data.
Red Hat Enterprise Linux 7
strongimcv
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | strongimcv | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
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
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Dec 3, 2025 · SSVC 2.0.3
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
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.22% (0.02222) | 82.06th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.31% (0.02312) | 81.10th | v5 (v2026.06.15) |
| May 27, 2026 | 2.10% (0.02101) | 84.30th | v4 (v2025.03.14) |
| Apr 13, 2026 | 0.96% (0.00959) | 76.47th | v4 (v2025.03.14) |
| Nov 21, 2025 | 2.10% (0.02101) | 83.52th | v4 (v2025.03.14) |
| Nov 18, 2025 | 0.72% (0.00723) | 70.30th | v4 (v2025.03.14) |
| Aug 30, 2025 | 2.10% (0.02101) | 83.38th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.80% (0.00798) | 72.34th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.50% (0.00496) | 77.02th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.50% (0.00496) | 75.54th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.50% (0.00496) | 73.27th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.67% (0.00669) | 76.61th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.62% (0.01623) | 33.90th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.62% (0.01623) | 0.00th | v1 |
References (9)
- http://www.debian.org/security/2017/dsa-3866 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/98756 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3301-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-9023 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1457122 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-9023
- https://www.cve.org/CVERecord?id=CVE-2017-9023
- https://www.strongswan.org/blog/2017/05/30/strongswan-vulnerability-%28cve-2017-9023%29.html x_refsource_CONFIRM
- https://www.strongswan.org/blog/2017/05/30/strongswan-vulnerability-(cve-2017-9023).html
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3866 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| http://www.securityfocus.com/bid/98756 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.ubuntu.com/usn/USN-3301-1 | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2017-9023 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1457122 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-9023 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-9023 | ||
| https://www.strongswan.org/blog/2017/05/30/strongswan-vulnerability-%28cve-2017-9023%29.html | x_refsource_CONFIRM | |
| https://www.strongswan.org/blog/2017/05/30/strongswan-vulnerability-(cve-2017-9023).html |
Change history (0)
No recorded changes yet.