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CVE Record

CVE-2020-3590: Cisco SD-WAN vManage Software Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of the Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-3590 is a cross-site scripting flaw in Cisco SD-WAN vManage's web management interface. An authenticated remote attacker could use crafted input and a crafted link to run script in a user's browser session, potentially exposing browser-held sensitive information.

Executive priority

Treat this as a moderate-priority management-plane issue. It is not listed as KEV exploited, but vManage is sensitive infrastructure, and browser-session compromise can support broader administrative risk.

Technical view

The issue is CWE-79 input validation failure in Cisco SD-WAN vManage. The CVSS 3.1 score is 6.4. The vector indicates network reachability, low attack complexity, low privileges, changed scope, low confidentiality impact, low integrity impact, and no availability impact.

Likely exposure

Exposure is limited to organizations running Cisco SD-WAN vManage. The provided bundle does not name affected or fixed versions, so teams must map deployed versions against Cisco's advisory.

Exploitation context

The bundle describes exploitation by persuading a user to click a crafted link. CISA KEV is false, and the supplied sources do not show active exploitation.

Researcher notes

The evidence supports authenticated XSS in the vManage web interface. The provided bundle lacks affected version details, fixed release details, and observed exploitation evidence. Avoid assuming broader Cisco SD-WAN component impact without vendor confirmation.

Mitigation direction

  • Review Cisco's advisory for affected and fixed release guidance.
  • Inventory all Cisco SD-WAN vManage deployments and owners.
  • Prioritize remediation for externally reachable or broadly accessible management interfaces.
  • Restrict vManage interface access to intended administrative users while assessing.
  • Review authenticated vManage users and remove unnecessary access.

Validation and detection

  • Confirm whether Cisco SD-WAN vManage is deployed in the environment.
  • Compare installed vManage versions with Cisco advisory guidance.
  • Verify the web management interface is not broadly reachable.
  • Review logs for unusual authenticated web management activity.
  • Confirm remediation status after applying Cisco-directed updates.
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 · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-3590 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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
6.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.4Medium
CVSS 3.1 vector shape for CVE-2020-3590Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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 vManagen/aListed
Weakness

CWE details

CWE-79

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

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs