CVE-2025-3268
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been found in qinguoyi TinyWebServer up to 1.0 and classified as critical. This vulnerability affects unknown code of the file http/http_conn.cpp. The manipulation of the argument m_url_real leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA critical authentication bypass vulnerability exists in qinguoyi TinyWebServer up to v1.0 in http/http_conn.cpp. The m_url_real argument is not properly validated before allowing access, allowing unauthenticated remote attackers to access protected resources.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 1.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if TinyWebServer is installedSearch for TinyWebServer files or processes on the system. Common locations include /usr/local/bin/, /opt/, or check running processes with 'ps aux | grep tiny' or 'ps aux | grep TinyWebServer'. Also check for service files or systemd units.Affected if TinyWebServer is found running or installed on the system
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Determine the installed versionCheck the version of TinyWebServer by examining the binary (e.g., 'tinywebserver -v' or 'tinywebserver --version'), looking at version information in the source files, or checking the installation directory for version markers. If built from source, check git tags or version headers.Affected if The version is 1.0 or any version <= 1.0, as all versions up to and including 1.0 are affected
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Locate and inspect http_conn.cppFind the http_conn.cpp source file in the TinyWebServer installation or source code directory. Search for the string 'm_url_real' to locate the vulnerable authentication validation logic.Affected if The file exists and contains m_url_real without proper validation checks before granting access to protected resources
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Verify if authentication is enforced on endpointsIf the server is running, attempt to access protected endpoints without credentials using a tool like curl (e.g., 'curl http://<server>/protected_path'). Compare the behavior against expected authentication challenges (HTTP 401, redirect to login, etc.).Affected if Protected resources are accessible without any authentication credentials being provided
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Check for external authentication controlsIf TinyWebServer is behind a reverse proxy (nginx, apache), verify whether authentication is handled at the proxy layer. Inspect proxy configuration files for auth requirements.Affected if TinyWebServer is directly exposed without any external authentication layer and the version is <= 1.0
A user is affected if TinyWebServer version 1.0 or lower is installed, the http_conn.cpp file contains the vulnerable m_url_real validation logic, and protected resources can be accessed without authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate or patch TinyWebServer to the latest version. If no patch is available, implement external authentication controls (e.g., reverse proxy with authentication) or manually audit and fix the authentication logic in http_conn.cpp to properly validate m_url_real before granting access.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-3268 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-3268 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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