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Fencer Vulns
high 7.5

CVE-2017-9023 json

The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allows remote attackers…

published 2017-06-08 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-17963

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

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.

Patch / fix

  • strongswan Debian 14, Debian 13, Debian 12 5.5.1-4

debian advisories DEBIAN-CVE-2017-9023

  • strongswan Ubuntu 14.04 LTS 5.1.2-0ubuntu2.6
  • strongswan Ubuntu 16.04 LTS 5.3.5-1ubuntu3.3

ubuntu advisories UBUNTU-CVE-2017-9023

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • strongswan SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 5.1.3-25.1
  • strongswan SLES for SAP 11 SP4, SLES 11 SP4 4.4.0-6.35.1

suse advisories SUSE-SU-2017:1473-1SUSE-SU-2017:1471-1

  • strongswan openSUSE Tumbleweed 5.9.0-1.9

opensuse advisories openSUSE-SU-2024:11411-1

  • strongswan Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 5.5.3-r0
  • strongswan Alpine 3.3, Alpine 3.2 5.3.5-r2
  • strongswan Alpine 3.4 5.4.0-r2

alpine advisories ALPINE-CVE-2017-9023

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-9023 updated cvss 3.7

strongswan: Incorrect Handling of CHOICE types in ASN.1 parser and x509 plugin

  • Red Hat Enterprise Linux 7 strongimcv
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-19-155-01 updated cvss 7.5

PHOENIX CONTACT PLCNext AXC F 2152

  • Phoenix Contact AXC F 2152 2404267 version 1.x, 1046568 (Starterkit) version 1.x
    affected: vendor fix, mitigation “Phoenix Contact recommends affected users update to firmware release 2019.0 LTS or later, update to PLCNext Engineer release 2019.0 LTS or later, and apply the following specific mitigations below:” phoenixcontact.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

2.22% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.