Is CVE-2009-1957 in the CISA KEV catalog?

No. CVE-2009-1957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-1957?

CVE-2009-1957 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2009-1957?

CVE-2009-1957 has an EPSS score of 2.95% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-1957?

Upgrade strongswan on debian 11 to 4.2.14-1.1 or later.

CVE & CISA-KEV Catalog

CVE-2009-1957

MEDIUMEPSS 85th pctl

5.0

CVSS v2

NVD

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.

CWE-399Resource Management Errors

How to fix

Remediation Available

strongswanDebian

Fixed in:4.2.14-1.1CVE-2009-1957

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.95%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Patch2

Vendor Advisory1

download.strongswan.org

Other references7

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	Fix

Embed a live status badge for CVE-2009-1957

Markdown

[![CVE-2009-1957](https://tridentstack.com/cve/badge/CVE-2009-1957.svg)](https://tridentstack.com/cve/CVE-2009-1957)

HTML

<a href="https://tridentstack.com/cve/CVE-2009-1957"><img src="https://tridentstack.com/cve/badge/CVE-2009-1957.svg" alt="CVE-2009-1957"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.