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Cloudline Cl3100 Gen10 Server FirmwareOperating system · Hpe

CVE-2021-25127

HIGH · 7.8 CVSS v3.1 Published 2021-01-29
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
80/100
Remediation priority · High
Zero-click

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 · unedited
The 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 generatesslcertificate_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 · high confidence

Local buffer overflow vulnerability in the BMC (Baseboard Management Controller) firmware of HPE Cloudline servers. The overflow occurs in the spx_restservice generatesslcertificate_func function when generating SSL certificates, potentially allowing local attackers to execute arbitrary code or cause denial of service.

MitigationApply the HPE firmware update for the BMC when available. Until then, restrict physical and local access to the BMC management interfaces and monitor for suspicious certificate generation requests.

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
Cloudline Cl3100 Gen10 Server FirmwareOperating system
Affected:= 1.08.0.0= 1.10.0.0
Cloudline Cl4100 Gen10 Server FirmwareOperating system
Affected:= 1.08.0.0= 1.10.0.0
Cloudline Cl5200 Gen9 Server FirmwareOperating system
Affected:= 1.07.0.0
Cloudline Cl5800 Gen10 Server FirmwareOperating system
Affected:= 1.08.0.0
Cloudline Cl5800 Gen9 Server FirmwareOperating system
Affected:= 1.09.0.0

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
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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify HPE Cloudline server model
    Check the server model number via iLO/BMC web interface, BIOS, or command such as 'dmidecode -s system-product-name' or 'ipmitool mc info'. Look for CL3100, CL4100, CL5200, or CL5800.
    Affected if Server model is NOT one of these four Cloudline models - user is NOT affected.
  2. Retrieve BMC firmware version
    Access the BMC web interface and navigate to the firmware version page, or run 'ipmitool mc info' or 'ipmitool raw command' to query BMC firmware version. Look for the firmware version string.
    Affected if Firmware version matches exactly 1.08.0.0, 1.10.0.0 (CL3100/CL4100 Gen10), 1.07.0.0 (CL5200 Gen9), or 1.09.0.0 (CL5800 Gen9) - user IS affected.
  3. Verify REST service is accessible
    Check if the spx_restservice is running by accessing the BMC REST API endpoint (typically https://<BMC-IP>/rest/v1) or using 'ipmitool raw' commands to query the service. Confirm the REST API responds to requests.
    Affected if The REST service is enabled and accessible on the network - attack surface exists. Combined with affected firmware version, user IS likely affected.
  4. Check SSL certificate generation endpoint
    Attempt to access or query the SSL certificate generation function via the REST API endpoint /rest/v1/Managers/Self/Certificates or equivalent, or use ipmitool to invoke the generatesslcertificate_func if exposed.
    Affected if The certificate generation endpoint is reachable - this confirms the vulnerable function is exposed. Combined with affected firmware, user IS affected.

A user is affected only if they are running an HPE Cloudline CL3100, CL4100, CL5200, or CL5800 server with BMC firmware version exactly matching 1.08.0.0, 1.10.0.0, 1.07.0.0, or 1.09.0.0, and the REST service with SSL certificate generation feature is accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the HPE firmware update for the BMC when available. Until then, restrict physical and local access to the BMC management interfaces and monitor for suspicious certificate generation requests.

Fix this in Cloudline Cl3100 Gen10 Server Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-25127 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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