CVE-2021-25137
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 Baseboard Management Controller(BMC) in HPE Cloudline CL5800 Gen9 Server; HPE Cloudline CL5200 Gen9 Server; HPE Cloudline CL4100 Gen10 Server; HPE Cloudline CL3100 Gen10 Server; HPE Cloudline CL5800 Gen10 Server BMC firmware has a local buffer overlfow in spx_restservice startflash_func function.
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 buffer overflow vulnerability exists in the HPE Cloudline BMC firmware's spx_restservice component, specifically in the startflash_func function. This local vulnerability could allow an authenticated attacker with local access to execute arbitrary code or cause a denial of service via the overflow. The CVSS 7.8 score reflects high impact but local attack vector requiring physical or console access.
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= 1.08.0.0= 1.10.0.0= 1.08.0.0= 1.10.0.0= 1.07.0.0= 1.08.0.0= 1.09.0.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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 the Cloudline server modelAccess BMC web interface or use IPMI/Redfish command (e.g., ipmitool -I lanplus -U admin -P password mc info) to retrieve server model informationAffected if Model is CL3100 Gen10, CL4100 Gen10, CL5200 Gen9, CL5800 Gen10, or CL5800 Gen9
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Retrieve BMC firmware versionVia BMC web interface under 'Overview' or 'Firmware Information' page, or run: ipmitool -I lanplus -U admin -P password mc info or access Redfish endpoint /redfish/v1/Managers/SelfAffected if Version matches 1.08.0.0, 1.10.0.0, 1.07.0.0, or 1.09.0.0 for the identified model
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Verify spx_restservice component is presentCheck BMC for running services or review firmware release notes; the spx_restservice component is included in standard Cloudline BMC firmwareAffected if spx_restservice is present in the firmware build (default for affected versions)
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Confirm local or console authentication is enabledReview BMC security settings via web interface under 'Security' or use IPMI command: ipmitool -I lanplus -U admin -P password lan printAffected if BMC local user accounts or console access is configured and enabled
User is affected if running one of the listed Cloudline models with firmware version matching the affected versions and the BMC is accessible for authenticated local/console attacks.
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 dataApply the HPE firmware update for affected Cloudline CL5800/CL5200 Gen9 and CL4100/CL3100/CL5800 Gen10 servers when available. Until then, restrict physical access to servers and limit BMC console authentication to trusted personnel only.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25137 — 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-2021-25137 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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