CVE-2025-41706
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 · uneditedThe webserver is vulnerable to a denial of service condition. An unauthenticated remote attacker can craft a special GET request with an over-long content-length to trigger the issue without affecting the core functionality.
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 denial of service vulnerability exists in the webserver where an unauthenticated attacker can send a specially crafted GET request containing an excessively long Content-Length header value. This causes the server to allocate excess resources or enter an error state while processing the malformed request, resulting in service disruption.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- None
- Integrity
- None
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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 webserver software and versionRun 'httpd -v' for Apache, 'nginx -v' for Nginx, or check the server response header (Server: ) via 'curl -I <target>' to determine the exact version installedAffected if The installed version falls within any affected version ranges for CVE-2025-41706 (compare your version to vendor advisories)
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Verify unauthenticated HTTP access is permittedSend a basic GET request to the server without credentials using 'curl -v http://<target>/' and confirm a response is receivedAffected if The server responds to unauthenticated requests on HTTP/HTTPS ports (the vulnerability requires unauthenticated access)
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Inspect Content-Length header handling configurationCheck the webserver configuration file (httpd.conf, nginx.conf) for any directives that limit or validate the Content-Length header value, such as 'LimitRequestFieldSize', 'client_max_body_size', or custom header validation rulesAffected if No Content-Length validation or header size limits are configured (server will accept arbitrarily long header values)
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Check for request size or rate limitingReview the configuration for rate limiting modules (mod_rate_limit for Apache, limit_req for Nginx) or request size restrictions using 'grep -i limit \path\to\config'Affected if No rate limiting or request size restrictions are in place to block oversized Content-Length headers
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Test for anomalous header processingSend a GET request with an excessively long Content-Length header: 'curl -v -H "Content-Length: 99999999999999999999" http://<target>/' and observe server response behaviorAffected if The server accepts the request without rejecting it or closing the connection, indicating potential vulnerability
You are affected if your webserver accepts unauthenticated requests and lacks Content-Length header validation or size limits, allowing an attacker to trigger resource exhaustion via oversized header values.
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 dataImplement input validation to limit and sanitize Content-Length header values, and consider deploying rate limiting or request size restrictions at the webserver or network perimeter to mitigate rapid repeated attacks.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-41706 — 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-2025-41706 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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