What is the CVSS score of CVE-2021-22021?

CVE-2021-22021 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.5%.

Is there a patch available for CVE-2021-22021?

Yes, a patch is available for CVE-2021-22021. Update the affected software to the latest version immediately.

Vrealize Log Insight CVE-2021-22021

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2021-08-30 security@vmware.com

XSS VMware Cloud Foundation Vrealize Log Insight

5.4

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-79 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Output encoding, context-aware escaping MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required.
Exploit ScenarioDerived	A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.5% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

VMware vRealize Log Insight (8.x prior to 8.4) contains a Cross Site Scripting (XSS) vulnerability due to improper user input validation. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. VMware vRealize Log Insight (8.x prior to 8.4) contains a Cross Site Scripting (XSS) vulnerability due to improper user input validation. An attacker with user privileges may be able to inject a malicious payload via the Log Insight UI which would be executed when the victim accesses the shared dashboard link. Affected products include: Vmware Cloud Foundation, Vmware Vrealize Log Insight. Version information: prior to 8.4.

Know when Vrealize Log Insight gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

DescriptionNVD

VMware vRealize Log Insight (8.x prior to 8.4) contains a Cross Site Scripting (XSS) vulnerability due to improper user input validation. An attacker with user privileges may be able to inject a malicious payload via the Log Insight UI which would be executed when the victim accesses the shared dashboard link.

Threat Intelligence Overview

EPSS Score

0.5%

Top 63% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.5%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +27

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)NVD

cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*

cpe:2.3:a:vmware:vrealize_log_insight:*:*:*:*:*:*:*:*

More in Vrealize Log Insight

View all

CVE-2016-2082 HIGH This Week

8.8 Jul 03

Cross-site request forgery (CSRF) vulnerability in VMware vRealize Log Insight 2.x and 3.x before 3.3.2 allows remote at

CVE-2022-31703 HIGH This Week

7.5 Dec 14

The vRealize Log Insight contains a Directory Traversal Vulnerability. Rated high severity (CVSS 7.5), this vulnerabilit

CVE-2018-6980 HIGH This Week

7.2 Nov 13

VMware vRealize Log Insight (4.7.x before 4.7.1 and 4.6.x before 4.6.2) contains a vulnerability due to improper authori

CVE-2016-2081 MEDIUM This Month

6.1 Jul 03

Cross-site scripting (XSS) vulnerability in VMware vRealize Log Insight 2.x and 3.x before 3.3.2 allows remote attackers

CVE-2020-3954 MEDIUM This Month

6.1 Apr 15

Open Redirect vulnerability exists in VMware vRealize Log Insight prior to 8.1.0 due to improper Input validation. Rated

CVE-2022-31655 MEDIUM This Month

5.4 Jul 12

VMware vRealize Log Insight in versions prior to 8.8.2 contain a stored cross-site scripting vulnerability due to improp

CVE-2022-31654 MEDIUM This Month

5.4 Jul 12

VMware vRealize Log Insight in versions prior to 8.8.2 contain a stored cross-site scripting vulnerability due to improp

CVE-2016-5332 MEDIUM This Month

5.3 Aug 31

Directory traversal vulnerability in VMware vRealize Log Insight 2.x and 3.x before 3.6.0 allows remote attackers to rea

CVE-2020-3953 MEDIUM This Month

4.8 Apr 15

Cross Site Scripting (XSS) vulnerability exists in VMware vRealize Log Insight prior to 8.1.0 due to improper Input vali

CVE-2021-22035 MEDIUM This Month

4.3 Oct 13

VMware vRealize Log Insight (8.x prior to 8.6) contains a CSV(Comma Separated Value) injection vulnerability in interact

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all

CVE-2020-3580 MEDIUM POC

6.1

CVE-2013-7389 MEDIUM POC

4.3

CVE-2021-25299 MEDIUM POC

6.1

CVE-2014-2120 MEDIUM

6.1

CVE-2023-40000 HIGH POC

8.3

CVE-2016-8581 MEDIUM POC

6.1

CVE-2013-5223 MEDIUM POC

5.4

CVE-2025-52367 MEDIUM POC

5.4

Same technique XSS

View all

CVE-2017-9248 CRITICAL POC

9.8

CVE-2013-1710 CRITICAL POC

10.0

CVE-2024-52875 HIGH POC

8.8

References

Advisories & patches

PATCH https://www.vmware.com/security/advisories/VMSA-2021-0019.html

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back