How severe is CVE-2017-9023?

CVE-2017-9023 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-9023 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9023?

CVE-2017-9023 affects Strongswan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9023?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-9023 published?

CVE-2017-9023 was published on 2017-06-08 and last updated on 2026-06-17.

CVE-2017-9023

CVE-2017-9023 is a high-severity vulnerability in Strongswan with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Strongswan
Published: 2017-06-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2017-9023?: 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.
How severe is CVE-2017-9023?: CVE-2017-9023 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-9023 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9023?: CVE-2017-9023 affects Strongswan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9023?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-9023 published?: CVE-2017-9023 was published on 2017-06-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:strongswan:strongswan:*:*:*:*:*:*:*:*

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