How severe is CVE-2021-31164?

CVE-2021-31164 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-31164 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31164?

CVE-2021-31164 affects Apache Unomi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31164?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31164 published?

CVE-2021-31164 was published on 2021-05-04 and last updated on 2026-06-17.

CVE-2021-31164

CVE-2021-31164 is a high-severity vulnerability in Apache Unomi with a CVSS 3.x base score of 7.5. 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-74.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Apache Unomi
Published: 2021-05-04
Last modified: 2026-06-17

Description

Apache Unomi prior to version 1.5.5 allows CRLF log injection because of the lack of escaping in the log statements.

Frequently asked questions

What is CVE-2021-31164?: Apache Unomi prior to version 1.5.5 allows CRLF log injection because of the lack of escaping in the log statements.
How severe is CVE-2021-31164?: CVE-2021-31164 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-31164 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31164?: CVE-2021-31164 affects Apache Unomi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31164?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31164 published?: CVE-2021-31164 was published on 2021-05-04 and last updated on 2026-06-17.

References

http://unomi.apache.org/security/cve-2021-31164

Affected products (1)

cpe:2.3:a:apache:unomi:*:*:*:*:*:*:*:*

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