CVE-2020-13942
High PUBLISHEDRemote Code Execution in Apache Unomi
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Nov 24, 2020
- Exploitation Reported
- Jun 06, 2026
- CVSS
- 9.8 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Apache Software Foundation |
Apache Unomi
|
unspecified to < 1.5.2 |
Affected |
CVE References
- [unomi-dev] 20201124 CVE-2020-13942: Remote Code Execution in Apache Unomi lists.apache.org · Mailing List https://lists.apache.org/thread.html/rcb6d2eafcf15def433aaddfa06738e5...
- [unomi-users] 20201124 CVE-2020-13942: Remote Code Execution in Apache Unomi lists.apache.org · Mailing List https://lists.apache.org/thread.html/rcb6d2eafcf15def433aaddfa06738e5...
- [unomi-users] 20201124 Apache Unomi 1.5.4 Release lists.apache.org · Mailing List https://lists.apache.org/thread.html/r4a8fa91836687eaca42b5420a778ca8...
- [unomi-dev] 20201124 Apache Unomi 1.5.4 Release lists.apache.org · Mailing List https://lists.apache.org/thread.html/r4a8fa91836687eaca42b5420a778ca8...
- [oss-security] 20201124 CVE-2020-13942: Remote Code Execution in Apache Unomi openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2020/11/24/5
Show 4 more references
- [announce] 20201124 CVE-2020-13942: Remote Code Execution in Apache Unomi lists.apache.org · Mailing List https://lists.apache.org/thread.html/r08a4057ff7196b8880117edaa4b6207...
- [unomi-commits] 20210428 svn commit: r1889256 - in /unomi/website: contribute-release-guide.html documentation.html download.html index.html security/cve-2021-31164.txt lists.apache.org · Mailing List https://lists.apache.org/thread.html/r79672c25e0ef9bb4b9148376281200a...
- unomi.apache.org./security/cve-2020-13942.txt unomi.apache.org. · CVE Record http://unomi.apache.org./security/cve-2020-13942.txt
- advisory.checkmarx.net/advisory/CX-2020-4284 advisory.checkmarx.net · CVE Record https://advisory.checkmarx.net/advisory/CX-2020-4284
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-06-09 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-13942.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2026-06-06 00:00:00 UTC · The Shadowserver
Proof of concept available
Recorded 2020-11-19 08:22:17 UTC · GitHub
Weaknesses (CWE)
-
Improper Input Validation
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-13942.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2021-09-05 16:39:19 UTC · 0 stars
github · Created 2020-12-22 02:57:50 UTC · 4 stars
CVE-2020-13942 Apache Unomi 远程代码执行漏洞脚getshell
github · Created 2020-11-21 08:48:46 UTC · 3 stars
github · Created 2020-11-20 23:25:44 UTC · 9 stars
CVE-2020-13942 POC + Automation Script
github · Created 2020-11-19 08:22:17 UTC · 28 stars
CVE-2020-13942 unauthenticated RCE POC through MVEL and OGNL injection
github · Created 2020-11-18 10:29:47 UTC · 6 stars
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
18:00 UTC over 5 years ago18:00 UTC · over 5 years ago
CVE published
Vulnerability disclosed publicly
-
10:29 UTC over 5 years ago10:29 UTC · over 5 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC about 6 years ago00:00 UTC · about 6 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2020-13942
{
"cve_id": "CVE-2020-13942",
"title": "Remote Code Execution in Apache Unomi",
"affected_vendor": "Apache Software Foundation",
"affected_product": "Apache Unomi",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}