How severe is CVE-2021-38997?

CVE-2021-38997 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-38997 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38997?

CVE-2021-38997 affects Ibm Api Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38997?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-38997 published?

CVE-2021-38997 was published on 2022-12-12 and last updated on 2026-06-17.

CVE-2021-38997

CVE-2021-38997 is a medium-severity vulnerability in Ibm Api Connect with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-116.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-116
Affected product: Ibm Api Connect
Published: 2022-12-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-38997?: 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.
How severe is CVE-2021-38997?: CVE-2021-38997 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-38997 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38997?: CVE-2021-38997 affects Ibm Api Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38997?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-38997 published?: CVE-2021-38997 was published on 2022-12-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ibm:api_connect:*:*:*:*:*:*:*:*

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