CVE-2009-20009
CVE-2009-20009 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-121.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.3)
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2009-5122
- Weakness: CWE-121
- Published:
- Last modified:
Description
Belkin Bulldog Plus version 4.0.2 build 1219 contains a stack-based buffer overflow vulnerability in its web service authentication handler. When a specially crafted HTTP request is sent with an oversized Authorization header, the application fails to properly validate the input length before copying it into a fixed-size buffer, resulting in memory corruption and potential remote code execution. Exploitation requires network access and does not require prior authentication.
Frequently asked questions
- What is CVE-2009-20009?
- Belkin Bulldog Plus version 4.0.2 build 1219 contains a stack-based buffer overflow vulnerability in its web service authentication handler. When a specially crafted HTTP request is sent with an oversized Authorization header, the application fails to properly validate the input length before copying it into a fixed-size buffer, resulting in memory corruption and potential remote code execution. Exploitation requires network access and does not require prior authentication.
- How severe is CVE-2009-20009?
- CVE-2009-20009 has a CVSS 4.0 base score of 9.3, rated critical severity.
- Is CVE-2009-20009 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2009-20009?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2009-20009 have an EU (EUVD) identifier?
- Yes. CVE-2009-20009 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2009-5122.
- When was CVE-2009-20009 published?
- CVE-2009-20009 was published on 2025-08-30 and last updated on 2026-06-16.
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/belkin_bulldog.rb
- https://s3.belkin.com/support/dl/bulldogwindows.pdf
- https://www.exploit-db.com/exploits/8173
- https://www.fortiguard.com/encyclopedia/ips/17325/belkin-bulldog-plus-web-services-buffer-overflow
- https://www.vulncheck.com/advisories/belkin-bulldog-plus-web-service-buffer-overflow
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