HOMEVULNERABILITIESCVE-2021-3396
HIGH

CVE-2021-3396

NVD-CWE-OtherPublished: February 17, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

OpenNMS Meridian 2016, 2017, 2018 before 2018.1.25, 2019 before 2019.1.16, and 2020 before 2020.1.5, Horizon 1.2 through 27.0.4, and Newts <1.5.3 has Incorrect Access Control, which allows local and remote code execution using JEXL expressions.

NVD Source

Technical Analysis

CVE-2021-3396 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

opennms3 product(s)
horizonmeridiannewts
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.opennms.com
ADVISORYhttps://www.opennms.com/en/blog/2021-02-16-cve-2021-3396-full-security-disclosure/
ADVISORYhttps://www.opennms.com
ADVISORYhttps://www.opennms.com/en/blog/2021-02-16-cve-2021-3396-full-security-disclosure/

All References (4)

→
https://www.opennms.comVendor Advisory
→
https://www.opennms.com/en/blog/2021-02-16-cve-2021-3396-full-security-disclosure/Vendor Advisory
→
https://www.opennms.comVendor Advisory
→
https://www.opennms.com/en/blog/2021-02-16-cve-2021-3396-full-security-disclosure/Vendor Advisory

Quick Facts

CVE IDCVE-2021-3396
CVSS Score8.8 / 10
SeverityHIGH
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 17, 2021

Related CVEs (NVD-CWE-Other)

CVE-1999-1467
10.0
CVE-1999-0498
10.0
CVE-2011-4752
10.0
CVE-1999-0082
10.0
CVE-1999-1193
10.0
CVE-1999-1493
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3396 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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