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Vulnerabilities

Vulnerability · 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.

Published Aug 30, 2025 · catalog updated May 15, 2026 · Belkin International, Inc. Bulldog Plus UPS Monitoring Software

Last checked Oct 24, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2009-20009. EPSS is 1.81%. Act only if a listed version of Belkin International, Inc. Bulldog Plus UPS Monitoring Software is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.81%
Remediation
Vendor / distro source
Affected products
vendor Belkin International, Inc. Bulldog Plus UPS Monitoring Software 0 ≤4.0.2 build 1219

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Belkin International, Inc. Bulldog Plus UPS Monitoring Software 0 ≤4.0.2 build 12190 ≤4.0.2 build 1219

How to fix CVE-2009-20009

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2009-20009. EPSS is 1.81%. Act only if a listed version of Belkin International, Inc. Bulldog Plus UPS Monitoring Software is installed.

Which versions are affected?

Compare what you have installed with Belkin International, Inc. Bulldog Plus UPS Monitoring Software 0 ≤4.0.2 build 1219 0 ≤4.0.2 build 1219. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.81%. There is no CISA KEV listing. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 30, 2025 · EUVD

    Detected

    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. E

  2. May 15, 2026 · EUVD

    Updated

    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. E

Sources

  • CVE.orgVulnerability recordCVE-2009-20009

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2009-20009

    30-day exploitation probability 1.81%

    first.org
  • EUVDVulnerability recordEUVD-2009-5122

    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

    euvd.enisa.europa.eu
  • Metasploit ModulesPublic exploit moduleexploit_windows/http/belkin_bulldog

    Public module reference (average). Module source is not copied into this catalog.

    rapid7.com

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • Metasploit ModulesOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 21, 2026