Is CVE-2008-4609 in the CISA KEV catalog?

No. CVE-2008-4609 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2008-4609?

CVE-2008-4609 has a CVSS v2 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2008-4609?

CVE-2008-4609 has an EPSS score of 32.12% (98th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2008-4609?

Upgrade catalyst blade switch 3020 firmware to 12.2(50) or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2008-4609

HIGHEPSS 98th pctl

7.1

CVSS v2

NVD

Description

The TCP implementation in (1) Linux, (2) platforms based on BSD Unix, (3) Microsoft Windows, (4) Cisco products, and probably other operating systems allows remote attackers to cause a denial of service (connection queue exhaustion) via multiple vectors that manipulate information in the TCP state table, as demonstrated by sockstress.

CWE-16

How to fix

Remediation Available

catalyst blade switch 3020 firmwareNVD

Affected:< 12.2(50)Fixed in:12.2(50)CVE-2008-4609derived from NVD

catalyst blade switch 3120 firmwareNVD

Affected:< 12.2(50)Fixed in:12.2(50)CVE-2008-4609derived from NVD

catalyst blade switch 3120x firmwareNVD

Affected:< 12.2(50)Fixed in:12.2(50)CVE-2008-4609derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

32.12%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Patch1

docs.microsoft.com

Third-Party Advisory3

Other references11

Related Vulnerabilities

Other CWE-16 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-2335	Medium	5.0	85%	-	Fix
CVE-2004-2687	High	9.3	81%	-	Fix
CVE-2006-3677	High	7.5	78%	-	Fix
CVE-2011-4404	Medium	5.0	60%	-	-
CVE-2006-0848	Medium	5.1	58%	-	-
CVE-2007-3898	Medium	6.4	52%	-	-

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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.