Big Ip Access Policy ManagerApplication · F5
CVE-2020-27715
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 · uneditedOn BIG-IP 15.1.0-15.1.0.5 and 14.1.0-14.1.3, crafted TLS request to the BIG-IP management interface via port 443 can cause high (~100%) CPU utilization by the httpd daemon.
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 · high confidenceA denial-of-service vulnerability in F5 BIG-IP allows remote attackers to cause 100% CPU utilization on the httpd daemon by sending crafted TLS requests to the management interface on port 443. This renders the management interface unresponsive.
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
Big Ip Access Policy ManagerApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Advanced Firewall ManagerApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip AnalyticsApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Application Acceleration ManagerApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Application Security ManagerApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Domain Name SystemApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Fraud Protection ServiceApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1
Big Ip Global Traffic ManagerApplication
>= 14.1.0, < 14.1.3.1>= 15.0.0, < 15.1.1CVSS 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
- High
CVSS:3.1/AV:N/AC:L/PR:N/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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Confirm F5 BIG-IP is deployedRun 'tmsh show sys version' or check the management GUI login page for F5 brandingAffected if The system is an F5 BIG-IP device
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Identify installed BIG-IP versionExecute 'tmsh show sys version' and note the version number displayed (e.g., 14.1.0.3)Affected if The version falls within 14.1.0 to 14.1.3.0 OR 15.0.0 to 15.1.0.5 (not patched to 14.1.3.1 or 15.1.1+)
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Verify management interface is accessibleCheck if TCP port 443 is open and accepting connections on the management IP using 'nc -zv <management_ip> 443' or nmapAffected if Port 443 is reachable from untrusted networks (not restricted to admin/management VLANs)
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Confirm httpd daemon is runningRun 'tmsh show sys service httpd' to verify the httpd service is activeAffected if The httpd daemon is running and the version check above shows a vulnerable version
If the F5 BIG-IP version is 14.1.0-14.1.3.0 or 15.0.0-15.1.0.5 AND the management interface (port 443) is accessible from networks beyond trusted admin ranges, the environment is vulnerable to CVE-2020-27715.
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 data14.1.3.115.1.1
Restrict access to the BIG-IP management interface (port 443) to trusted networks only, and apply vendor patches for versions 14.1.0-14.1.3 and 15.1.0-15.1.0.5.
Fix this in Big Ip Access Policy Manager
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27715 — 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-2020-27715 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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