TI-2021-16429 Aliases CVE-2021-38997 GHSA-56xq-39jp-p7r8

IBM API Connect HOST header injection

LOW 25CWE-644Published 2022-12-01 · Updated 2025-04-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0043 37th percentileScored 2026-11-07

Fix Fixed API Connect (IBM): 10.0.5.0, 10.0.1.7, 2018.4.1.19

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
IBM	API Connect	10.0.0.0 to before 10.0.5.0; 10.0.1.0 to before 10.0.1.7; 2018.4.1.0 to before 2018.4.1.19	10.0.5.0, 10.0.1.7, 2018.4.1.19	Patch available	CNA

API Connect VendorIBM Affected 10.0.0.0 to before 10.0.5.0; 10.0.1.0 to before 10.0.1.7; 2018.4.1.0 to before 2018.4.1.19 Fixed in 10.0.5.0, 10.0.1.7, 2018.4.1.19 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ibm:api_connect::::::::	10.0.0.0 – 10.0.5.0; 10.0.1.0 – 10.0.1.7; 2018.4.1.0 – 2018.4.1.19	Vulnerable	IBM

cpe:2.3:a:ibm:api_connect:*:*:*:*:*:*:*:* Versions 10.0.0.0 – 10.0.5.0; 10.0.1.0 – 10.0.1.7; 2018.4.1.0 – 2018.4.1.19 Vulnerable ·IBM

Remediation

Fix · CNA API Connect (IBM) Fixed in 10.0.5.0, 10.0.1.7, 2018.4.1.19

Timeline

2026-10-02 Threatist record created from CVE-2021-38997
2026-10-03 Alias added: GHSA-56xq-39jp-p7r8

References

Patch 1

https://www.ibm.com/support/pages/node/6842621

TI-2025-12717 Authentication bypass in IBM API Connect CVSS 3.1CRITICAL 9.8
TI-2019-03132 OS command injection in IBM API Connect CVSS 3.1CRITICAL 10.0
TI-2026-07972 IBM API Connect SQL Injection CVSS 3.1CRITICAL 9.8
TI-2019-03106 IBM API Connect's Developer Portal 2018.1 and 2018.4.1.3 is impacted by a privilege… CVSS 3.0CRITICAL 9.8
TI-2018-01353 IBM API Connect Developer Portal 5.0.0.0 through 5.0.8.2 could allow an unauthenticated… CVSS 3.0CRITICAL 9.8
TI-2019-03133 Server-side request forgery in IBM API Connect CVSS 3.1CRITICAL 9.8

See all 80 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences