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CVE Record

CVE-2020-26063: Cisco Integrated Management Controller Software Authorization Bypass Vulnerability

A vulnerability in the API endpoints of Cisco Integrated Management Controller could allow an authenticated, remote attacker to bypass authorization and take actions on a vulnerable system without authorization. The vulnerability is due to improper authorization checks on API endpoints. An attacker could exploit this vulnerability by sending malicious requests to an API endpoint. An exploit could allow the attacker to download files from or modify limited configuration options on the affected system.There are no workarounds that address this vulnerability.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw affects Cisco Integrated Management Controller API authorization. A logged-in remote user could perform actions they should not be allowed to perform, including downloading files or changing limited configuration settings. The impact is limited but relevant because CIMC manages server hardware.

Executive priority

Treat as a scheduled but important infrastructure management-plane fix. It is not described as unauthenticated or actively exploited, but compromised or overprivileged accounts could abuse CIMC to access files or alter limited settings.

Technical view

CVE-2020-26063 is an improper authorization check issue in Cisco CIMC API endpoints. The CVSS 3.1 score is 5.4, with network access, low privileges, no user interaction, and low confidentiality and integrity impact. The source bundle names Cisco Unified Computing System (Managed) CIMC releases as affected.

Likely exposure

Exposure is most likely where Cisco UCS CIMC management interfaces are reachable by authenticated users beyond tightly controlled administrators, especially on listed 3.2, 4.0, and 4.1 releases.

Exploitation context

The bundle does not show KEV listing or active exploitation evidence. Exploitation requires authentication and remote network access to vulnerable CIMC API endpoints. Sources describe possible unauthorized file download or limited configuration modification, but not public exploitation.

Researcher notes

Evidence is limited to the CVE record and Cisco advisory references in the bundle. The affected list is specific, but fixed-release details are not included here. Avoid broad product assumptions beyond Cisco UCS Managed CIMC versions named in the source data.

Mitigation direction

  • Review Cisco advisory cisco-sa-cimc-auth-zWkppJxL for fixed software guidance.
  • Upgrade affected CIMC deployments only to Cisco-recommended fixed releases.
  • Do not rely on workarounds; Cisco states none address this vulnerability.
  • Restrict CIMC API access to approved management users and networks where possible.

Validation and detection

  • Inventory Cisco UCS Managed CIMC versions across server management planes.
  • Compare deployed versions with the affected version list in the CVE source bundle.
  • Confirm CIMC API access is limited to intended administrative roles.
  • Review logs for unusual authenticated CIMC API file or configuration activity.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-269: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2020-26063 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X2.82.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.4Medium
CVSS 3.1 vector shape for CVE-2020-26063Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Unified Computing System (Managed)4.0(1a), 3.2(3n), 4.1(1a), 4.1(1b), 4.0(4h), 4.1(1c), 3.2(3k), 3.2(2c), 4.0(4e), 4.0(4g), 3.2(3i), 4.0(2e), 3.2(3g), 4.0(4a), 4.0(2d), 3.2(2d), 4.0(1b), 4.0(4f), 3.2(3h), 3.2(2f), 4.0(4c), 3.2(3a), 4.0(1c), 3.2(3d), 3.2(2b), 4.0(4b), 3.2(2e), 4.0(2b), 4.0(4d), 3.2(1d), 3.2(3e), 3.2(3l), 3.2(3b), 4.0(2a), 3.2(3j), 4.0(1d), 3.2(3o), 4.0(4i), 4.1(1d), 4.1(2a), 4.1(1e), 3.2(3p), 4.1(2b)unknown
Weakness

CWE details

CWE-269

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-269 · source CWE mapping

Improper Privilege Management

Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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