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CVE Record

CVE-2020-17147: Dynamics CRM Webclient Cross-site Scripting Vulnerability

Dynamics CRM Webclient Cross-site Scripting Vulnerability

HighCVSS 8.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2020-17147 is a high-severity cross-site scripting issue in Microsoft Dynamics CRM Webclient. A successful attack could let an authenticated attacker influence a user’s browser session after user interaction, potentially exposing sensitive CRM data or changing data through the victim’s privileges.

Executive priority

Treat this as a patch-priority issue for affected on-premises CRM environments because CRM systems often hold sensitive customer, sales, and operational data.

Technical view

The supplied CVSS vector indicates network reachability, low attack complexity, low privileges required, and required user interaction. Scope is changed, with high confidentiality and integrity impact and no availability impact. The affected products listed are Dynamics 365 on-premises version 8.2 and version 9.0.

Likely exposure

Exposure is most likely in organizations still running affected Microsoft Dynamics 365 on-premises deployments, especially CRM webclient instances reachable by internal users or remote authenticated users.

Exploitation context

The supplied bundle does not show CISA KEV listing or active exploitation. CVSS exploit maturity is marked unproven, so treat exploitation as plausible but not confirmed from these sources.

Researcher notes

Do not assume cloud Dynamics 365 exposure from the supplied data. The key risk drivers are authenticated access, required victim interaction, changed scope, and high confidentiality and integrity impact. Patch availability is indicated, but exact fixed builds are not included in the bundle.

Mitigation direction

  • Follow Microsoft MSRC patch guidance for CVE-2020-17147.
  • Prioritize affected internet-accessible or broadly accessible CRM webclient deployments.
  • Restrict CRM access to trusted users and networks where feasible.
  • Review vendor guidance before applying compensating controls.
  • Retire or upgrade unsupported affected on-premises deployments.

Validation and detection

  • Inventory Dynamics 365 on-premises version 8.2 and 9.0 systems.
  • Confirm installed build and patch status against Microsoft MSRC guidance.
  • Check whether CRM webclient is externally reachable or broadly accessible.
  • Review CRM and web logs for suspicious authenticated webclient activity.
  • Validate remediation with safe authenticated regression testing.
Prepared
Confidence
medium
Sources
4

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

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CVE-2020-17147 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
High
CVSS
8.7 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

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
3Timeline events
1ADP providers
3Source 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
8.7CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C2.35.8microsoft

Vulnerability scoring details

Base CVSS 3.1 score

8.7High
CVSS 3.1 vector shape for CVE-2020-17147Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MicrosoftMicrosoft Dynamics 365 (on-premises) version 8.28.0Listed
MicrosoftMicrosoft Dynamics 365 (on-premises) version 9.09.0.0Listed
Weakness

CWE details

No CWE listed

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