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CVE Record

CVE-2021-25656: Avaya Aura Experience Portal XSS vulnerabilities

Stored XSS injection vulnerabilities were discovered in the Avaya Aura Experience Portal Web management which could allow an authenticated user to potentially disclose sensitive information. Affected versions include 7.0 through 7.2.3 (without hotfix) and 8.0.0 (without hotfix).

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw lets an authenticated user store malicious script content in Avaya Aura Experience Portal Web management. The cited impact is possible disclosure of sensitive information. It is medium severity because access is already required and the CVE record does not show public exploitation.

Executive priority

Treat as a planned remediation item unless management access is exposed or many users have privileges. Prioritize hotfix verification because the affected product can handle sensitive operational data.

Technical view

CVE-2021-25656 is stored XSS, CWE-79, in Avaya Aura Experience Portal Web management. Affected releases are 7.0 through 7.2.3 without hotfix and 8.0.0 without hotfix. CVSS 3.1 score is 5.3 with low privileges, low complexity, no user interaction, and low confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to environments running the affected Avaya Aura Experience Portal Web management versions without the relevant hotfix. Risk is higher where management access is broadly available to many authenticated users.

Exploitation context

The provided sources do not indicate active exploitation, public exploit availability, or CISA KEV listing. The vulnerability requires authentication according to the CVE description, reducing broad internet-scale risk but not insider or compromised-account risk.

Researcher notes

Evidence is sparse beyond the CVE description and Avaya reference. The product name in structured affected data is generic, but the description identifies Avaya Aura Experience Portal Web management. Do not assume other Avaya products are affected without vendor confirmation.

Mitigation direction

  • Apply the Avaya hotfix or vendor-supported update for affected versions.
  • Confirm Avaya guidance for exact fixed builds and deployment requirements.
  • Restrict Web management access to trusted administrators and networks.
  • Review accounts with management access and remove unnecessary privileges.

Validation and detection

  • Inventory Avaya Aura Experience Portal versions in all environments.
  • Confirm whether 7.0 through 7.2.3 or 8.0.0 lack the hotfix.
  • Verify management interfaces are not broadly reachable.
  • Review Web management users for unnecessary or stale access.
  • Check vendor advisory status before closing remediation tickets.
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-2021-25656 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
5.3 (3.1)
Known Exploited
No
Published

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

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
5.3CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L1.83.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-25656Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
AvayaProduct8.0, 7.2.3Listed
Weakness

CWE details

CWE-79

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