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CVE-2009-4420

20
FAUCET Score

CVE-2009-4420 describes a buffer overflow vulnerability in the bd daemon of F5 Networks BIG-IP Application Security Manager (ASM) and Protocol Security Manager (PSM) across several versions. This flaw allows unauthenticated remote attackers to cause a denial of service by crashing the affected systems. With a CVSS score of 7.8 (High), it presents a significant availability risk due to its network-based attack vector and low attack complexity. While no public exploit code or active exploitation has been observed, and community discussion is minimal, organizations using the affected F5 products should prioritize patching to mitigate this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
10.0.0CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_protocol_security_module:10.0.0:*:*:*:*:*:*:*
9.4.4CPE matchmatch criteria
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.4:*:*:*:*:*:*:*
9.4.5CPE matchmatch criteria
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.5:*:*:*:*:*:*:*
9.4.6CPE matchmatch criteria
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.6:*:*:*:*:*:*:*
9.4.7CPE matchmatch criteria
cpe:2.3:h:f5:big-ip_application_security_manager:9.4.7:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 66th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

osvdb.org / 61297
secunia.com / advisories/37805
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/55005
support.f5.com / kb/en-us/solutions/public/10000/400/sol10417.html
securityfocus.com / bid/37452
securitytracker.com / id
vupen.com / english/advisories/2009/3627
Vendor Advisory