CVE-2021-38997

5.4 mediumEPSS 0.4%

Medium (5.4) in ibm api connect. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-31)
CWEs: CWE-116, CWE-644
Published: 2022-12-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

ibm:api_connect

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/213212
https://www.ibm.com/support/pages/node/6842621
https://exchange.xforce.ibmcloud.com/vulnerabilities/213212
https://www.ibm.com/support/pages/node/6842621

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