CVE-2025-9177
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 denial-of-service security issue exists in the affected product and version. The security issue stems from a high number of requests sent to the web server. This could result in a web server crash however; this does not impact I/O control or communication . A power cycle is required to recover and utilize the webpage.
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 confidenceThis is a denial-of-service vulnerability where an attacker can crash the affected web server by sending a high volume of requests. The web server becomes unresponsive and requires a power cycle to recover. Notably, the underlying I/O control and communication functions remain unaffected by the crash.
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
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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 web server software and versionRun commands like 'nginx -v', 'httpd -v', 'apache2 -v', or check the application documentation to determine the exact version of the web server software in useAffected if The installed version matches or falls within any affected version range for this CVE (compare against vendor advisory)
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Verify rate limiting is configuredInspect the web server configuration files (e.g., nginx.conf, httpd.conf, .htaccess) for rate limiting directives such as 'limit_req_zone', 'LimitReqBody', or equivalent rate-limit settingsAffected if Rate limiting is NOT configured or is set to allow excessively high request volumes that could enable the DoS condition
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Confirm WAF or load balancer is deployedCheck network architecture documentation or inspect for the presence of a web application firewall (WAF), reverse proxy, or load balancer (e.g., ModSecurity, AWS WAF, HAProxy, F5 BIG-IP) in front of the web serverAffected if No WAF, reverse proxy, or load balancer is present to absorb or mitigate high-volume request attacks
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Check for network-level DDoS protectionReview network infrastructure configurations for DDoS mitigation services or appliances (e.g., cloud provider DDoS protection, dedicated anti-DDoS hardware) that can handle request volume spikesAffected if No network-level DDoS protection is in place to filter or absorb volumetric attacks before they reach the web server
A user is affected if their web server is exposed to high-volume request attacks without rate limiting, WAF, load balancer, or DDoS protection in place, and the installed version falls within the affected range.
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 rate limiting at the web server or network perimeter to restrict excessive requests. Consider deploying a web application firewall (WAF) or load balancer to absorb and mitigate high-volume request attacks.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-9177 — 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-2025-9177 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data