How severe is CVE-2009-4420?

CVE-2009-4420 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-4420 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-2009-4420?

CVE-2009-4420 primarily affects F5 Big-ip Protocol Security Module. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4420?

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-2009-4420 published?

CVE-2009-4420 was published on 2009-12-24 and last updated on 2026-06-16.

CVE-2009-4420

CVE-2009-4420 is a high-severity vulnerability in F5 Big-ip Protocol Security Module with a CVSS 2.0 base score of 7.8. 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-119.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: F5 Big-ip Protocol Security Module
Published: 2009-12-24
Last modified: 2026-06-16

Description

Buffer overflow in the bd daemon in F5 Networks BIG-IP Application Security Manager (ASM) 9.4.4 through 9.4.7 and 10.0.0 through 10.0.1, and Protocol Security Manager (PSM) 9.4.5 through 9.4.7 and 10.0.0 through 10.0.1, allows remote attackers to cause a denial of service (crash) via unknown vectors. NOTE: some of these details are obtained from third party information.

Frequently asked questions

What is CVE-2009-4420?: Buffer overflow in the bd daemon in F5 Networks BIG-IP Application Security Manager (ASM) 9.4.4 through 9.4.7 and 10.0.0 through 10.0.1, and Protocol Security Manager (PSM) 9.4.5 through 9.4.7 and 10.0.0 through 10.0.1, allows remote attackers to cause a denial of service (crash) via unknown vectors. NOTE: some of these details are obtained from third party information.
How severe is CVE-2009-4420?: CVE-2009-4420 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2009-4420 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-2009-4420?: CVE-2009-4420 primarily affects F5 Big-ip Protocol Security Module. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4420?: 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-2009-4420 published?: CVE-2009-4420 was published on 2009-12-24 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:f5:big-ip_protocol_security_module:10.0.0:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.4:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.5:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.6:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.7:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:10.0.0:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_application_security_manager:10.0.1:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.5:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.6:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.7:*:*:*:*:*:*:*
cpe:2.3:h:f5:big-ip_protocol_security_manager:10.0.1:*:*:*:*:*:*:*

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