CVE-2021-29872

IBM Cloud Pak for Automation 21.0.1 and 21.0.2 - Business Automation Studio Component is vulnerable to HTTP header injection, caused by improper validation of input by the HOST headers. By sending a specially crafted HTTP request, a remote attacker could exploit this vulnerability to inject HTTP HOST header, which will allow the attacker to conduct various attacks against the vulnerable system, including cross-site scripting, cache poisoning or session hijacking. IBM X-Force ID: 206228.

Published: 2022-01-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-29872 is rated Moderate Risk (40.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.77%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-29872

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.05% 0.77% +0.72%
2 2025-11-21 0.03% 0.05% +0.03%
3 2025-11-18 — 0.03% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-29872

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.3 2.7 [email protected]
5.4 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.5 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2021-29872

Affected software / configurations for CVE-2021-29872

Vendor Product Version Raw CPE
ibm cloud_pak_for_automation < 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:*:*:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:*:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix001:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix002:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix003:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix004:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix005:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.2 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.2:interim_fix006:*:*:*:*:*:*
ibm cloud_pak_for_automation < 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:*:*:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:*:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix001:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix002:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix003:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix004:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix005:*:*:*:*:*:*
ibm cloud_pak_for_automation 21.0.1 cpe:2.3:a:ibm:cloud_pak_for_automation:21.0.1:interim_fix006:*:*:*:*:*:*

References for CVE-2021-29872

cvelogic Threat Intelligence