What is CVE-2021-31164?

CVE-2021-31164 is a high-severity vulnerability in Apache Unomi, classified under CRLF Injection. CVSS score: 7.5/10. Published 2021-05-04.

How severe is CVE-2021-31164?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apache Unomi

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.

Vulnerability class: CRLF Injection

Published 2021-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.023 (83.0th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Apache Unomi
Apache Software Foundation Unomi — versions Apache Unomi

Weakness classification (CWE)

References

unomi.apache.org/security/cve-2021-31164 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31164?: CVE-2021-31164 is a high-severity vulnerability in Apache Unomi, classified under CRLF Injection. CVSS score: 7.5/10. Published 2021-05-04.
How severe is CVE-2021-31164?: High severity. CVSS v3 base score is 7.5 out of 10.