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CVE Record

CVE-2026-20133: A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view s...

A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. This vulnerability is due to insufficient file system restrictions. An authenticated attacker with netadmin privileges could exploit this vulnerability by accessing the vshell of an affected system. A successful exploit could allow the attacker to read sensitive information on the underlying operating system.

MediumCVSS 6.5Known exploitedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-20133 can let a logged-in Cisco Catalyst SD-WAN Manager administrator with netadmin privileges read sensitive operating-system information that should be restricted. This is mainly a confidentiality issue, not a system takeover based on provided evidence. Business urgency is moderate: prioritize where SD-WAN Manager is internet-accessible, broadly administered, or supports critical network operations.

Executive priority

Treat as a moderate-priority network management exposure. It does not indicate public unauthenticated exploitation in the provided evidence, but sensitive data access from a privileged account can support follow-on compromise. Address during the next security maintenance window, sooner for exposed or high-trust SD-WAN environments.

Technical view

Cisco describes insufficient file system restrictions in Catalyst SD-WAN Software affecting Cisco Catalyst SD-WAN Manager. An authenticated attacker with netadmin privileges can access vshell and read sensitive information from the underlying OS. CVSS 3.1 is 6.5, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. The provided title says unauthenticated remote, but the detailed description and CVSS require low privileges.

Likely exposure

Exposure is limited to organizations running listed Cisco Catalyst SD-WAN Manager versions and granting netadmin access. Risk increases if management interfaces are reachable from untrusted networks or if netadmin accounts are shared, weakly governed, or compromised. No affected CPEs were provided.

Exploitation context

Provided sources do not show known active exploitation. CISA KEV status is false in the bundle. Exploitation requires authenticated netadmin-level access according to the detailed description, so account compromise or insider misuse is the most relevant scenario.

Researcher notes

There is an evidence inconsistency: the title mentions unauthenticated remote access, while the description and CVSS vector indicate authenticated low-privilege access. Use Cisco’s advisory as authoritative for version-specific remediation. Do not assume code execution, integrity impact, availability impact, or active exploitation from the provided sources.

Mitigation direction

  • Review Cisco advisory cisco-sa-sdwan-authbp-qwCX8D4v for fixed releases or official workarounds.
  • Restrict SD-WAN Manager administrative access to trusted management networks.
  • Audit netadmin accounts and remove unnecessary privileges.
  • Enforce strong authentication and monitor privileged administrative sessions.
  • Prioritize remediation for internet-reachable or critical SD-WAN Manager deployments.

Validation and detection

  • Inventory Cisco Catalyst SD-WAN Manager versions against the affected version list.
  • Confirm whether vshell access is enabled or available to netadmin users.
  • Review privileged account lists for unnecessary netadmin assignments.
  • Check management-plane exposure from untrusted networks.
  • Monitor logs for unusual netadmin access or sensitive file access indicators.
Prepared
Confidence
medium
Sources
4

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

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cwe · medium confidence lookup

CWE-200: Information exposure and cloud metadata lookup

Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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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cve · low confidence lookup

CVE-2026-20133 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
Yes
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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
3Source links

CISA KEV status

Status
Known exploited
Source
CISA / ADP
Date added
Not provided

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
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2026-20133Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 Catalyst SD-WAN Manager17.2.6, 17.2.7, 17.2.8, 17.2.9, 17.2.10, 17.2.4, 17.2.5, 18.3.1.1, 18.3.3.1, 18.3.3, 18.3.4, 18.3.5, 18.3.7, 18.3.8, 18.3.6.1, 18.3.1, 18.3.0, 18.4.0.1, 18.4.3, 18.4.302, 18.4.303, 18.4.4, 18.4.5, 18.4.0, 18.4.1, 18.4.6, 19.2.0, 19.2.097, 19.2.099, 19.2.1, 19.2.2, 19.2.3, 19.2.31, 19.2.929, 19.2.4, 20.1.1.1, 20.1.12, 20.1.1, 20.1.2, 20.1.3, 19.3.0, 19.1.0, 18.2.0, 20.3.1, 20.3.2, 20.3.2.1, 20.3.3, 20.3.3.1, 20.3.4, 20.3.4.1, 20.3.4.2, 20.3.5, 20.3.6, 20.3.7, 20.3.7.1, 20.3.4.3, 20.3.5.1, 20.3.7.2, 20.3.8, 20.4.1, 20.4.1.1, 20.4.1.2, 20.4.2, 20.4.2.2, 20.4.2.1, 20.4.2.3, 20.5.1, 20.5.1.2, 20.5.1.1, 20.6.1, 20.6.1.1, 20.6.2.1, 20.6.2.2, 20.6.2, 20.6.3, 20.6.3.1, 20.6.4, 20.6.5, 20.6.5.1, 20.6.5.3, 20.6.1.2, 20.6.3.2, 20.6.4.1, 20.6.5.2, 20.6.5.4, 20.6.3.3, 20.6.4.2, 20.6.3.0.45, 20.6.3.0.46, 20.6.3.0.47, 20.6.3.4, 20.6.4.0.21, 20.6.5.1.10, 20.6.5.1.11, 20.6.5.1.7, 20.6.5.1.9, 20.6.5.2.4, 20.6.5.5, 20.6.5.2.8, 20.6.5.1.13, 20.6.6, 20.6.7, 20.6.8, 20.7.1, 20.7.1.1, 20.7.2, 20.8.1, 20.9.1, 20.9.2, 20.9.2.1, 20.9.3, 20.9.3.1, 20.9.2.3, 20.9.3.0.12, 20.9.3.0.16, 20.9.3.0.17, 20.9.3.0.18, 20.9.3.0.20, 20.9.3.0.21, 20.9.3.2, 20.9.3.2_LI_Images, 20.9.4, 20.9.4_LI_Images, 20.9.3.0.23, 20.9.4.1, 20.9.5, 20.9.5.1, 20.9.5.2, 20.9.6, 20.9.5.3, 20.9.7, 20.9.7.1, 20.9.8, 20.10.1, 20.10.1.1, 20.10.1.2, 20.11.1, 20.11.1.1, 20.11.1.2, 20.12.1, 20.12.1_LI_Images, 20.12.2, 20.12.3, 20.12.3.1, 20.12.4, 20.12.4.1, 20.12.5, 20.12.5.1, 20.12.5.2, 20.12.6, 20.13.1, 20.14.1, 20.15.1, 20.15.2, 20.15.3, 20.15.3.1, 20.15.4, 20.15.4.1, 20.16.1, 20.18.1, 20.18.2Listed
Weakness

CWE details

CWE-200

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CWE-200 · source CWE mapping

Exposure of Sensitive Information to an Unauthorized Actor

Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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