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ExploitedNot in CISA KEV yetFix available

CVE-2020-13942

Exploitation confirmed. First attested on 2023-10-14 by GCVE · kevintel, GCVE · shadowserver.

  • Published2020-11-24
  • Fixed in1.5.2
  • WeaknessCWE-20 · CWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-11-2418:15CVE publishedNVD
  2. 2023-10-1415:43Listed as exploited by GCVEGCVE
  3. 2023-10-1415:43Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-13942?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-13942?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Apache unomi
BranchAffectedFixed in
1.5≥ 1.5.0, < 1.5.21.5.2
1.5< 1.5.21.5.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Apache unomi to 1.5.2

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
9 repositories, unverifiedlp008/CVE-2020-13942eugenebmx/CVE-2020-13942shifa123/CVE-2020-13942-POC-blackmarketer/CVE-2020-13942yaunsky/Unomi-CVE-2020-13942
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-11-24
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-xp5j-wj4h-2jq9

Frequently asked questions

What is CVE-2020-13942?

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.

Is CVE-2020-13942 actively exploited?

Active exploitation of CVE-2020-13942 has not been confirmed. Its EPSS score was 68.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-13942?

CVE-2020-13942 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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