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CVE Record

CVE-2020-3591: Cisco SD-WAN vManage 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 of the interface. 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 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Cisco SD-WAN vManage had a web interface flaw that could let an authenticated attacker run script in another interface user’s browser. Business impact is mainly management-console integrity and possible browser-held sensitive information exposure, not direct system takeover based on the provided sources.

Executive priority

Treat as a scheduled remediation item unless vManage is widely exposed or used by many administrators. Prioritize alongside other management-plane issues because compromise of admin browser sessions can support broader operational risk.

Technical view

CVE-2020-3591 is a CWE-79 cross-site scripting issue in Cisco SD-WAN vManage’s web-based management interface caused by insufficient validation of user-supplied input. Cisco describes exploitation as requiring a crafted link and a user of the interface, with possible arbitrary script execution in that interface context.

Likely exposure

Exposure is limited to organizations running Cisco SD-WAN vManage. Risk increases where the management interface is reachable by broad internal networks or many authenticated users. The provided bundle does not identify specific affected versions.

Exploitation context

The CVE is not marked KEV, and the supplied sources do not show active exploitation. The described attack requires an authenticated remote attacker and user interaction through a crafted link.

Researcher notes

Evidence is incomplete on affected version ranges and fixed releases in the supplied bundle. Note the description references persuading a user to click a crafted link, while the provided CVSS vector lists UI:N; verify details against Cisco’s advisory.

Mitigation direction

  • Review Cisco’s advisory for affected and fixed vManage releases.
  • Upgrade or remediate according to Cisco’s current guidance.
  • Restrict vManage interface access to trusted administrative networks.
  • Limit vManage accounts to users with a business need.
  • Train administrators to avoid unsolicited management-console links.

Validation and detection

  • Inventory all Cisco SD-WAN vManage instances.
  • Compare deployed versions against Cisco’s advisory.
  • Confirm management interfaces are not broadly reachable.
  • Review vulnerability scanner results for CVE-2020-3591.
  • Check admin activity for suspicious interface-linked events.
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-2020-3591 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
4.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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
4.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2020-3591Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.