Unauthenticated code execution via oversized Authorization header
Published Aug 30, 2025 · Updated May 15, 2026
Stack-based buffer overflow in Belkin Bulldog Plus 4.0.2 build 1219 allows remote attackers to execute arbitrary code over HTTP. The web service authentication handler copies an oversized Authorization header into a fixed-size stack buffer without validating its length. Network access to the enabled HTTP service is sufficient; no prior authentication or user interaction is required, and exploitation can compromise the service process.
Summary
What happened
Stack-based buffer overflow in Belkin Bulldog Plus 4.0.2 build 1219 allows remote attackers to execute arbitrary code over HTTP. The web service authentication handler copies an oversized Authorization header into a fixed-size stack buffer without validating its length. Network access to the enabled HTTP service is sufficient; no prior authentication or user interaction is required, and exploitation can compromise the service process.
The record
- CVE
- CVE-2009-20009
- Published
- Aug 30, 2025
- Updated
- May 15, 2026
- Vendor
- Belkin
- Product
- Bulldog Plus UPS Monitoring Software
- Classifications
- CWE-121, CAPEC-100, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 30, 2025CVE publishedPublication date reported by the CVE source.
- May 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=4.0.2 build 1219
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Metasploit Belkin Bulldog Plus Web Service Buffer Overflow modulefunctional · demonstrated
- Belkin BullDog Plus UPS-Service Buffer Overflow Exploitfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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