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CVE-2021-31164

23
FAUCET Score

CVE-2021-31164 is a CRLF log injection vulnerability affecting Apache Unomi versions prior to 1.5.5, stemming from insufficient escaping in log statements. This high-severity flaw (CVSS 7.5) allows unauthenticated attackers to inject arbitrary log entries, potentially leading to log poisoning or other integrity issues. While no public exploits or active exploitation have been observed, and community discussion is minimal, the vulnerability's nature makes it a concern for affected deployments.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.5.5CPE matchmatch criteria
cpe:2.3:a:apache:unomi:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.28%
Probability of exploitation in next 30 days
EPSS Percentile
81.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0228 is in the 67th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.unomi:unomiFixed in: 1.5.5

Vendor Advisories (1)

mavenGHSA-rm7f-mpcj-w4f6high

Command injection in Apache Unomi

Jun 16, 2021

References

unomi.apache.org / security/cve-2021-31164
PatchVendor Advisory