What is the CVSS score of CVE-2021-29771?

CVE-2021-29771 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-2021-29771?

Yes, a patch is available for CVE-2021-29771. Update the affected software to the latest version immediately.

Infosphere Information Server CVE-2021-29771

MEDIUM

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

2021-11-02 psirt@us.ibm.com

XSS IBM Infosphere Information Server

5.4

CVSS 3.1 · NVD

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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)

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AnalysisAI

IBM InfoSphere Information Server 11.7 is vulnerable to cross-site scripting. 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. IBM InfoSphere Information Server 11.7 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. Affected products include: Ibm Infosphere Information Server.

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Exploit and PoC references, threat intelligence from 22 sources

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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

IBM InfoSphere Information Server 11.7 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.

Threat Intelligence Overview

EPSS Score

0.5%

Top 62% 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:ibm:infosphere_information_server:11.7:*:*:*:*:*:*:*

More in Infosphere Information Server

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CVE-2024-40689 CRITICAL Act Now

9.8 Jul 26

IBM InfoSphere Information Server 11.7 is vulnerable to SQL injection. Rated critical severity (CVSS 9.8), this vulnerab

CVE-2023-32336 CRITICAL Act Now

9.8 May 22

IBM InfoSphere Information Server 11.7 is affected by a remote code execution vulnerability due to insecure deserializat

CVE-2022-40752 CRITICAL Act Now

9.8 Nov 16

IBM InfoSphere DataStage 11.7 is vulnerable to a command injection vulnerability due to improper neutralization of speci

CVE-2022-22425 CRITICAL Act Now

9.8 Nov 03

"IBM InfoSphere Information Server 11.7 is potentially vulnerable to CSV Injection. Rated critical severity (CVSS 9.8),

CVE-2022-31768 CRITICAL Act Now

9.8 Jun 06

IBM InfoSphere Information Server 11.7 is vulnerable to SQL injection. Rated critical severity (CVSS 9.8), this vulnerab

CVE-2012-0204 CRITICAL Act Now

9.3 Jan 31

Untrusted search path vulnerability in InfoSphere Import Export Manager 8.1 through 9.1 in InfoSphere Information Server

CVE-2017-1383 CRITICAL Act Now

9.1 Aug 02

IBM InfoSphere Information Server 9.1, 11.3, and 11.5 is vulnerable to a XML External Entity Injection (XXE) attack when

CVE-2025-12531 CRITICAL Act Now

9.1 Nov 03

XML external entity injection in IBM InfoSphere Information Server 11.7.0.0 through 11.7.1.6 lets remote attackers who c

CVE-2022-40747 CRITICAL Act Now

9.1 Nov 03

"IBM InfoSphere Information Server 11.7 is vulnerable to an XML External Entity Injection (XXE) attack when processing X

CVE-2021-38948 CRITICAL Act Now

9.1 Nov 02

IBM InfoSphere Information Server 11.7 is vulnerable to an XML External Entity Injection (XXE) attack when processing XM

CVE-2025-36245 HIGH This Week

8.8 Sep 29

IBM InfoSphere 11.7.0.0 through 11.7.1.6 Information Server could allow an authenticated user to execute arbitrary comma

CVE-2024-31902 HIGH This Week

8.8 Jun 30

IBM InfoSphere Information Server 11.7 is vulnerable to cross-site request forgery which could allow an attacker to exec

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

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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

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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.ibm.com/support/pages/node/6509614 ADVISORY https://exchange.xforce.ibmcloud.com/vulnerabilities/202773

Search Externally

GitHub PoC

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