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.

Published: 2009-12-24 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-4420 is rated Moderate Risk (61/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.65%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-4420

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-15 2.97% 2.65% -0.32%
2 2025-03-30 1.86% 2.97% +1.11%
3 2025-03-29 — 1.86% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-4420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2009-4420

Affected software / configurations for CVE-2009-4420

Vendor Product Version Raw CPE
f5 big-ip_protocol_security_module 10.0.0 cpe:2.3:a:f5:big-ip_protocol_security_module:10.0.0:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 9.4.4 cpe:2.3:h:f5:big-ip_application_security_manager:9.4.4:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 9.4.5 cpe:2.3:h:f5:big-ip_application_security_manager:9.4.5:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 9.4.6 cpe:2.3:h:f5:big-ip_application_security_manager:9.4.6:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 9.4.7 cpe:2.3:h:f5:big-ip_application_security_manager:9.4.7:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 10.0.0 cpe:2.3:h:f5:big-ip_application_security_manager:10.0.0:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 10.0.1 cpe:2.3:h:f5:big-ip_application_security_manager:10.0.1:*:*:*:*:*:*:*
f5 big-ip_protocol_security_manager 9.4.5 cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.5:*:*:*:*:*:*:*
f5 big-ip_protocol_security_manager 9.4.6 cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.6:*:*:*:*:*:*:*
f5 big-ip_protocol_security_manager 9.4.7 cpe:2.3:h:f5:big-ip_protocol_security_manager:9.4.7:*:*:*:*:*:*:*
f5 big-ip_protocol_security_manager 10.0.1 cpe:2.3:h:f5:big-ip_protocol_security_manager:10.0.1:*:*:*:*:*:*:*

References for CVE-2009-4420

cvelogic Threat Intelligence