CVE-2021-29737Network attack vector

Information disclosure via improper REST certificate validation

Published Nov 2, 2021 · Updated Sep 16, 2024

Improper certificate validation in IBM InfoSphere Information Server 11.7 allows man-in-the-middle attackers to read REST API data. The Data Flow Designer Engine fails to validate the REST API server certificate correctly, but IBM has not disclosed the defective check. Exploitation requires interception or redirection of the engine's network connection; the published impact is disclosure, not modification or service interruption.

CVSS severity5.9
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in IBM InfoSphere Information Server 11.7 allows man-in-the-middle attackers to read REST API data. The Data Flow Designer Engine fails to validate the REST API server certificate correctly, but IBM has not disclosed the defective check. Exploitation requires interception or redirection of the engine's network connection; the published impact is disclosure, not modification or service interruption.

The record

CVE
CVE-2021-29737
Published
Nov 2, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
InfoSphere Information Server
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · InfoSphere Information Serverversion=11.7

Published CVSS scores

5.9IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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