CVE-2017-9023: strongswan Infinite Loop
CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2017-9023UBUNTU-CVE-2017-9023DEBIAN-CVE-2017-9023
Published 08-06-2017Last modified 03-12-2025
Vulnerability summary
CVE-2017-9023 is a high (CVSS 7.5) Infinite Loop vulnerability in strongswan. EPSS estimates a 2.22% chance of exploitation in the next 30 days, higher than 82.3% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
2.22%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 08-06-2017PublishedVulnerability first disclosed.
- 03-12-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
8 scores · 5 sources · 3 versionsHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
High 7.5Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.22%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
0.00 pp
From 2.22% on 18-09-2026
18-09-202618-10-2026
EPSS score2.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- strongswan< 5.5.3-r0 | < 5.3.5-r2 | < 5.4.0-r2
Debian1 product
- strongswan< 5.5.1-4
Strongswan1 product
- strongswan≤ 5.5.2
Ubuntu1 product
- strongswan< 5.1.2-0ubuntu2.6 | < 5.3.5-1ubuntu3.3
4 vendors · 4 products
