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CVE-2021-38997

IBM API Connect HOST header injection

MEDIUM
5.4
CVSS Score
Published: December 1, 2022 at 05:00 PM UTC
Updated: June 17, 2026 at 04:02 AM UTC
1 product affected across 1 vendorAPI Connect

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

IBM API Connect V10.0.0.0 through V10.0.5.0, V10.0.1.0 through V10.0.1.7, and V2018.4.1.0 through 2018.4.1.19 is vulnerable to HTTP header injection, caused by improper validation of input by the HOST headers. This could allow an attacker to conduct various attacks against the vulnerable system, including cross-site scripting, cache poisoning or session hijacking. IBM X-Force ID: 213212.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

API Connect· IBM
95%
10.0.0.0 ≤ v ≤ 10.0.5.010.0.0.0 ≤ v < 10.0.5.010.0.1.0 ≤ v ≤ 10.0.1.710.0.1.0 ≤ v < 10.0.1.72018.4.1.0 ≤ v ≤ 2018.4.1.192018.4.1.0 ≤ v < 2018.4.1.1910.0.0.010.0.1.02018.4.1.0
Affected range stops below 10.0.1.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2018.4.1.19, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

VDB EntryVendor Advisory
Source: [email protected]
https://exchange.xforce.ibmcloud.com/vulnerabilities/213212
Vendor AdvisoryPatch
Source: [email protected]
https://www.ibm.com/support/pages/node/6842621

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMibm
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-644CWE-116

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