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CVE-2020-17147

26
FAUCET Score

CVE-2020-17147 is a high-severity Cross-site Scripting (XSS) vulnerability affecting Microsoft Dynamics 365 Webclient. An authenticated attacker could exploit this flaw to inject malicious scripts, leading to high impact on confidentiality and integrity. The CVSS score is 8.7 (HIGH), indicating a network-based attack with low complexity requiring user interaction. There is no evidence of active exploitation, and public exploit code (Metasploit, Nuclei, ExploitDB) is unavailable. Despite its age, the vulnerability has received limited community discussion and media coverage, with only one article from BleepingComputer mentioning it.

Impacted Technologies

VendorProductVersion(s)CPE
8.2CPE matchmatch criteria
cpe:2.3:a:microsoft:dynamics_365:8.2:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:a:microsoft:dynamics_365:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.7HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.45%
Probability of exploitation in next 30 days
EPSS Percentile
70.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0145 is in the 87th percentile among its peer group of 890 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Dynamics 365 (on-premises) version 8.2
View patch
microsoftpatch availablevia msrc
Product: Microsoft Dynamics 365 (on-premises) version 9.0
View patch

Vendor Advisories (1)

microsoft2020-Dec/CVE-2020-17147Important

Dynamics CRM Webclient Cross-site Scripting Vulnerability

Dec 8, 2020

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2020-17147
PatchVendor Advisory
msrc.microsoft.com / update-guide/vulnerability/CVE-2020-17147