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CVE Record

CVE-2020-3340: Cisco Identity Services Engine Stored Cross-Site Scripting Vulnerabilities

Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker with administrative credentials to conduct a cross-site scripting (XSS) attack against a user of the interface. These vulnerabilities are due to insufficient validation of user-supplied input that is processed by the web-based management interface. An attacker could exploit these vulnerabilities by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information. To exploit these vulnerabilities, an attacker would need valid administrative credentials.

MediumCVSS 4.8Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Cisco ISE had stored XSS flaws in its web management interface. An attacker already holding administrative credentials could place malicious script into interface content, affecting another user who later views it. Business urgency is moderate: the prerequisite admin access limits broad exposure, but Cisco ISE is security infrastructure, so compromise of admin sessions matters.

Executive priority

Treat as a moderate-priority security infrastructure issue. It is not described as actively exploited, but Cisco ISE controls identity and network access decisions, so vulnerable management interfaces should be verified and remediated in the normal patch cycle.

Technical view

CVE-2020-3340 is CWE-79 stored XSS in Cisco Identity Services Engine Software. The issue comes from insufficient validation of user-supplied input processed by the web management interface. CVSS 3.0 is 4.8, with network access, low complexity, high privileges required, user interaction required, changed scope, and low confidentiality and integrity impact.

Likely exposure

Exposure is limited to Cisco ISE Software deployments with vulnerable web-based management interfaces. The provided bundle does not identify exact affected versions. Risk is mainly inside administrative workflows because exploitation requires valid administrative credentials and a victim using the interface.

Exploitation context

The source bundle does not report active exploitation, and KEV status is false. Exploitation requires an authenticated remote attacker with administrative credentials and a user interaction condition. Successful exploitation could run script in the interface context or access sensitive browser-based information.

Researcher notes

The key constraints are PR:H and UI:R. This is stored XSS with changed scope but only low confidentiality and integrity impact and no availability impact. The bundle does not provide affected version ranges, fixed versions, or page-level details, so validation should rely on Cisco’s advisory.

Mitigation direction

  • Review Cisco’s advisory for applicable fixed releases and upgrade guidance.
  • Restrict Cisco ISE management interface access to trusted admin networks.
  • Enforce strong administrative account controls, MFA, and least privilege.
  • Review administrative accounts for unnecessary or stale privileges.
  • Monitor Cisco ISE administrative activity for suspicious interface changes.

Validation and detection

  • Inventory all Cisco ISE Software deployments and exposed management interfaces.
  • Compare installed versions against Cisco’s advisory because versions are not listed in the bundle.
  • Confirm admin access is restricted to approved users and networks.
  • Review recent ISE admin changes for unexpected script-like content.
  • Check logs for unusual administrative activity around management interface pages.
Prepared
Confidence
medium
Sources
3

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-2020-3340 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/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
4.8CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.8Medium
CVSS 3.0 vector shape for CVE-2020-3340Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/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 Identity Services Engine Softwaren/aListed
Weakness

CWE details

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