Unauthenticated code execution via Cookie buffer overflow
Published Dec 29, 2025 · Updated Dec 29, 2025
Stack-based buffer overflow in D-Link DIR-600 2.15WWb02 allows remote attackers to execute arbitrary code via a crafted Cookie header. The hedwigcgi_main path obtains HTTP_COOKIE through sess_get_uid and passes it to sprintf into a fixed-size stack buffer without length validation. No authentication or user interaction is required; an oversized uid Cookie can overwrite saved registers and the return address to redirect execution to injected shellcode.
Summary
What happened
Stack-based buffer overflow in D-Link DIR-600 2.15WWb02 allows remote attackers to execute arbitrary code via a crafted Cookie header. The hedwigcgi_main path obtains HTTP_COOKIE through sess_get_uid and passes it to sprintf into a fixed-size stack buffer without length validation. No authentication or user interaction is required; an oversized uid Cookie can overwrite saved registers and the return address to redirect execution to injected shellcode.
The record
- CVE
- CVE-2025-15194
- Published
- Dec 29, 2025
- Updated
- Dec 29, 2025
- Vendor
- D-Link
- Product
- DIR-600
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 29, 2025CVE publishedPublication date reported by the CVE source.
- Dec 29, 2025Record 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=2.15WWb02
What conditions does exploitation require?
What is affected?
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
- hedwig.cgi Cookie stack-overflow proof of conceptfunctional · 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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