CVE-2021-29872Network attack vector

Session hijacking via authenticated Host header injection

Published Jan 18, 2022 · Updated Sep 16, 2024

HTTP header injection in IBM Cloud Pak for Business Automation 21.0.1 and 21.0.2 allows remote authenticated users to hijack sessions. Business Automation Studio accepts a crafted Host header without adequate validation, allowing the attacker-controlled value to influence generated HTTP headers. A low-privileged account and network access to the Studio interface are required; successful injection enables cross-site scripting, cache poisoning, or session hijacking without interrupting service.

CVSS severity5.4
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP header injection in IBM Cloud Pak for Business Automation 21.0.1 and 21.0.2 allows remote authenticated users to hijack sessions. Business Automation Studio accepts a crafted Host header without adequate validation, allowing the attacker-controlled value to influence generated HTTP headers. A low-privileged account and network access to the Studio interface are required; successful injection enables cross-site scripting, cache poisoning, or session hijacking without interrupting service.

The record

CVE
CVE-2021-29872
Published
Jan 18, 2022
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Cloud Pak for Business Automation
Classifications
CWE-116, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 18, 2022CVE 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=21.0.1
  2. Affected versionversion=21.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Cloud Pak for Business Automationversion=21.0.1; version=21.0.2

Published CVSS scores

5.4IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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