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CVE-2020-26064: A vulnerability in the web UI of Cisco SD-WAN vManage Software could allow an authenticated, remote attacke...

A vulnerability in the web UI of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to gain read and write access to information that is stored on an affected system. The vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing certain XML files. An attacker could exploit this vulnerability by persuading a user to import a crafted XML file with malicious entries. A successful exploit could allow the attacker to read and write files within the affected application.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Cisco SD-WAN vManage could mishandle specially crafted XML during import, letting an authenticated attacker access files inside the affected application. For executives, this is a moderate-risk management-plane issue because vManage controls SD-WAN operations and may contain sensitive configuration data.

Executive priority

Prioritize remediation where vManage is externally reachable or broadly accessible to administrators. This is not marked as actively exploited, but compromise of a network management platform can create business impact beyond the CVSS score.

Technical view

The issue is CWE-611 XML External Entity handling in the Cisco SD-WAN vManage web UI. The provided description says a crafted XML file with malicious entries could lead to read and write access to files within the affected application. The CVSS vector is 6.5 with high confidentiality impact.

Likely exposure

Exposure is likely limited to organizations running Cisco SD-WAN vManage versions listed in the source bundle, especially where authenticated users can access XML import features. Internet exposure of the management UI would increase operational risk, but the sources do not identify exposed instances.

Exploitation context

The bundle marks KEV as false, and no cited source states active exploitation. The described attack requires authenticated remote access and a crafted XML import path. Cisco’s description also mentions persuading a user to import the XML file, so human workflow may matter.

Researcher notes

Evidence is limited to the CVE record and Cisco advisory reference in the bundle. The CVSS vector lists UI:N, while the narrative describes persuading a user to import crafted XML; treat workflow requirements as source-dependent and verify in Cisco guidance.

Mitigation direction

  • Inventory Cisco SD-WAN vManage deployments and compare versions against the affected list.
  • Review Cisco’s advisory for fixed releases or vendor-approved remediation guidance.
  • Restrict vManage web UI access to trusted administrative networks and users.
  • Limit XML import permissions to necessary administrators only.
  • Treat XML files from untrusted sources as unsafe until vendor remediation is applied.

Validation and detection

  • Confirm each vManage appliance version against the affected versions in the advisory data.
  • Review administrative roles allowed to import XML through the vManage web UI.
  • Check whether the vManage UI is reachable from untrusted networks.
  • Review logs for unusual XML import activity or unexpected file access indicators.
Prepared
Confidence
medium
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 · low confidence lookup

CWE-611: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2020-26064 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/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
2Source 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
6.5CVSS 3.0MediumCVSS:3.0/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 3.0 score

6.5Medium
CVSS 3.0 vector shape for CVE-2020-26064Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/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 SD-WAN vManage17.2.6, 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, 19.2.0, 19.2.097, 19.2.099, 19.2.1, 19.2.2, 19.2.3, 19.2.31, 19.2.929, 20.1.1.1, 20.1.12, 20.1.1, 19.3.0, 19.1.0, 18.2.0, 20.3.1Listed
Weakness

CWE details

CWE-611

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

CWE-611 · source CWE mapping

Improper Restriction of XML External Entity Reference

Improper Restriction of XML External Entity Reference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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