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CVE Record

CVE-2020-26066: Cisco SD-WAN vManage Software XML External Entity Vulnerability

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.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

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 Software has an XML parsing flaw that could let an authenticated remote attacker access files inside the affected application after a crafted XML import. Cisco has released updates and states there are no workarounds.

Executive priority

Treat as a scheduled but important remediation for SD-WAN management systems. The issue is not sourced as actively exploited, but it affects a high-value control plane and has high confidentiality impact.

Technical view

The issue is CWE-611 XXE in the web UI when parsing certain XML files. The source says exploitation requires a crafted XML file and can permit read and write access within the affected application. CVSS 3.0 score is 6.5, with high confidentiality impact.

Likely exposure

Exposure is likely limited to organizations running affected Cisco SD-WAN vManage or Cisco Catalyst SD-WAN Manager versions listed in the source bundle. Risk depends on authenticated access to the management interface and use of XML import functionality.

Exploitation context

The bundle marks this CVE as not in KEV. No provided source claims active exploitation. The described path involves an authenticated remote attacker and a crafted XML file imported through the web UI.

Researcher notes

The source data has one ambiguity: the description says a user is persuaded to import crafted XML, while the CVSS vector lists UI:N. Avoid assuming exploit mechanics beyond authenticated remote abuse of XML parsing in the web UI.

Mitigation direction

  • Upgrade affected Cisco SD-WAN vManage or Catalyst SD-WAN Manager software using Cisco guidance.
  • Do not rely on a workaround; Cisco states none addresses this vulnerability.
  • Inventory deployed versions against the affected version list in the advisory.
  • Limit management interface access to authorized administrators as a general control.

Validation and detection

  • Confirm installed Cisco SD-WAN Manager or vManage versions against the affected list.
  • Verify the Cisco fixed software update is installed and documented.
  • Review administrative activity for unexpected XML imports by authenticated users.
  • Check Cisco advisory details for fixed-release mapping before remediation closure.
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 · 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-2020-26066 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/E:X/RL:X/RC: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
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:N/E:X/RL:X/RC:X2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.5Medium
CVSS 3.0 vector shape for CVE-2020-26066Attack 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/E:X/RL:X/RC: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 Catalyst SD-WAN Manager20.1.12, 19.2.1, 18.4.4, 18.4.5, 20.1.1.1, 20.1.1, 19.3.0, 19.2.2, 19.2.099, 18.3.6, 18.3.7, 19.2.0, 18.3.8, 19.0.0, 19.1.0, 18.4.302, 18.4.303, 19.2.097, 19.2.098, 17.2.10, 18.3.6.1, 19.0.1a, 18.2.0, 18.4.3, 18.4.1, 17.2.8, 18.3.3.1, 18.4.0, 18.3.1, 17.2.6, 17.2.9, 18.3.4, 17.2.5, 18.3.1.1, 18.3.5, 18.4.0.1, 18.3.3, 17.2.7, 17.2.4, 18.3.0, 19.2.3, 18.4.501_ES, 20.3.1, 19.2.929, 19.2.31unknown
Weakness

CWE details

CWE-611

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