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CVE Record

CVE-2020-3587: 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

Cisco SD-WAN vManage has a medium-severity XSS flaw in its web management interface. An authenticated remote attacker could trick a user into opening a crafted link, causing script execution in that user’s browser session and possible exposure of browser-held sensitive information.

Executive priority

Treat as a moderate-priority network management risk. It is not listed as actively exploited in the provided sources, but compromise of an SD-WAN management user session can create meaningful business impact.

Technical view

CVE-2020-3587 is CWE-79 in Cisco SD-WAN vManage. The management interface insufficiently validates user-supplied input. Cisco’s record describes authenticated remote exploitation through a crafted link, with impact limited to confidentiality and integrity, no availability impact. CVSS v3.1 score is 6.4.

Likely exposure

Exposure is most likely where Cisco SD-WAN vManage is deployed and its web-based management interface is reachable by authenticated users. The source bundle does not provide affected version ranges, so inventory must be checked against Cisco’s advisory.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires authenticated remote access and user deception via a crafted link, according to the CVE description. No public exploit status is established in the bundle.

Researcher notes

The bundle lacks affected version details and fixed-release information. The CVSS vector lists UI:N, while the description says exploitation involves persuading a user to click a crafted link; note this inconsistency when validating risk.

Mitigation direction

  • Identify all Cisco SD-WAN vManage deployments and owners.
  • Review Cisco’s advisory for affected releases and fixed software guidance.
  • Apply vendor-recommended updates or mitigations where applicable.
  • Limit access to the vManage web management interface while remediation is assessed.
  • Educate administrators not to open untrusted vManage links.

Validation and detection

  • Confirm whether Cisco SD-WAN vManage is deployed in the environment.
  • Compare installed versions with Cisco’s advisory once available.
  • Verify remediation status for each vManage instance.
  • Confirm management interface access is limited to intended authenticated users.
  • Review recent administrative browser/session alerts for suspicious activity.
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.

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cve · low confidence lookup

CVE-2020-3587 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-2020-3587Attack 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