CVE-2025-5253
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 · uneditedAllocation of Resources Without Limits or Throttling vulnerability in Kron Technologies Kron PAM allows HTTP DoS. This issue affects Kron PAM: before 3.7.
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 confidenceKron PAM versions before 3.7 contain an allocation of resources without limits or throttling vulnerability (CWE-770) that allows remote attackers to cause HTTP-based denial of service by exhausting server resources through malformed or excessive requests.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 Kron PAM installation and versionRun the command 'kron-pam --version' or 'pam --version', or check the installed package via package manager (e.g., 'rpm -qi kron-pam' or 'dpkg -l kron-pam') to retrieve the installed version numberAffected if The installed version is found to be lower than 3.7 (e.g., 3.6.x, 3.5.x, or any version below 3.7)
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Confirm HTTP service is exposedVerify that the Kron PAM HTTP interface is running and accessible. Check if the service is listening on HTTP ports (typically 80/443 or configured ports) via 'netstat -tlnp | grep -i kron' or 'ss -tlnp | grep -i kron'. Also verify firewall rules allow HTTP traffic to the hostAffected if The HTTP service is running and reachable from network locations where attackers could send malformed or excessive requests
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Check for existing rate limiting configurationReview any web server, load balancer, or WAF configuration in front of Kron PAM for rate limiting rules. Inspect configuration files in /etc/, /opt/, or the application's config directory for rate-limit, throttle, or similar directivesAffected if No rate limiting or throttling mechanisms are configured in the HTTP infrastructure layer
Your environment is affected if Kron PAM version is below 3.7 and the HTTP interface is network-accessible without rate limiting protections in place.
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.
dbcve · scopedUpgrade to Kron PAM version 3.7 or later. In the interim, implement HTTP request rate limiting and connection throttling at the load balancer or WAF level to mitigate HTTP DoS attempts.
Kron PAM version 3.7
- 1. Identify the current installed version of Kron PAM
- 2. Backup the current Kron PAM configuration and data
- 3. Obtain Kron PAM version 3.7 or later from official Kron Technologies distribution channels
- 4. Follow Kron Technologies official upgrade procedure to install version 3.7
- 5. After upgrade, verify the new version is running (e.g., check /opt/kron/pam/version or similar)
- 6. Test that the HTTP service is functioning normally and not vulnerable to resource exhaustion
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,968.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-5253 — 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-2025-5253 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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- 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
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