CVE-2021-38997

Name: CVE-2021-38997
Creator: NVD / NIST
Published: 2022-12-12T09:15:11.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2021-38997 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.38%

29.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ibm	Api Connect	>= 10.0.0.0, <= 10.0.5.0
Ibm	Api Connect	>= 10.0.1.0, <= 10.0.1.7
Ibm	Api Connect	>= 2018.4.1.0, <= 2018.4.1.19

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/213212VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6842621Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/213212VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6842621Patch, Vendor Advisory

Timeline

Published: Dec 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38997?

How severe is CVE-2021-38997?

CVE-2021-38997 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38997?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38997?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST