How severe is CVE-2009-1957?

CVE-2009-1957 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-1957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1957?

CVE-2009-1957 primarily affects Strongswan. In total, 70 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1957?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-1957 published?

CVE-2009-1957 was published on 2009-06-08 and last updated on 2026-06-16.

CVE-2009-1957

CVE-2009-1957 is a medium-severity vulnerability in Strongswan with a CVSS 2.0 base score of 5.0. 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-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Strongswan
Published: 2009-06-08
Last modified: 2026-06-16

Description

charon/sa/ike_sa.c in the charon daemon in strongSWAN before 4.3.1 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an invalid IKE_SA_INIT request that triggers "an incomplete state," followed by a CREATE_CHILD_SA request.

Frequently asked questions

What is CVE-2009-1957?: charon/sa/ike_sa.c in the charon daemon in strongSWAN before 4.3.1 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an invalid IKE_SA_INIT request that triggers "an incomplete state," followed by a CREATE_CHILD_SA request.
How severe is CVE-2009-1957?: CVE-2009-1957 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-1957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1957?: CVE-2009-1957 primarily affects Strongswan. In total, 70 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1957?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-1957 published?: CVE-2009-1957 was published on 2009-06-08 and last updated on 2026-06-16.

References

Affected products (70)

cpe:2.3:a:strongswan:strongswan:*:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.1.5:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.2.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.3.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.0a:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.3:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.4.4:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.3:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.4:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.5:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.6:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.5.7:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.1:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.3:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.4:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.16:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.6.20:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.8.0:*:*:*:*:*:*:*
cpe:2.3:a:strongswan:strongswan:2.8.1:*:*:*:*:*:*:*

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