Apache

CVE-2020-13942: Remote Code Execution in Apache Unomi

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 12 Apr 2021. It cites 759 public reports, the first from 12 Apr 2021. VulnCheck's own honeypots also recorded exploitation attempts.

How likely is exploitation in the next 30 days?

68.3%

EPSS score, percentile 99.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

before 1.5.2

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Remote Code Execution in Apache Unomi

It is possible to inject malicious OGNL or MVEL scripts into the /context.json public endpoint. This was partially fixed in 1.5.1 but a new attack vector was found. In Apache Unomi version 1.5.2 scripts are now completely filtered from the input. It is highly recommended to upgrade to the latest available version of the 1.5.x release to fix this problem.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)

Apache Software Foundation Apache Unomi
Status	Versions
Affected	before 1.5.2

Source: CVE List, as of 30 Oct 2026. About the data.

Weakness

CWE-20

CWE-20: Improper Input Validation

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

Date	Event
24 Nov 2020	CVE record published
13 Feb 2025	CVE record last updated

References

Known exploited Apache vulnerabilities

CVE-2016-3081: Apache Struts Command Injection Vulnerability (added 8 Oct 2026)
CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability (added 4 Aug 2026)
CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability (added 16 Apr 2026)
CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability (added 1 May 2025)
CVE-2025-24813: Apache Tomcat Path Equivalence Vulnerability (added 1 Apr 2025)