CVE-2016-6555Public exploitNetwork attack vector

Browser session compromise via unsanitized trap data

Published Jun 15, 2022 · Updated Sep 17, 2024

Stored XSS in OpenNMS Horizon 18.0.1 and earlier allows remote attackers to execute script in an authenticated user's browser via SNMP traps. Trapd accepts SNMP v1 or v2c traps with any community string, stores their unfiltered varbind data as events, and eventlist.jsp renders log messages without WebSecurityUtils sanitization. No OpenNMS account or registered source host is required, but an authenticated user must open the events list; injected script can read session data and perform web actions with that user's privileges.

CVSS severity6.1
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OpenNMS Horizon 18.0.1 and earlier allows remote attackers to execute script in an authenticated user's browser via SNMP traps. Trapd accepts SNMP v1 or v2c traps with any community string, stores their unfiltered varbind data as events, and eventlist.jsp renders log messages without WebSecurityUtils sanitization. No OpenNMS account or registered source host is required, but an authenticated user must open the events list; injected script can read session data and perform web actions with that user's privileges.

The record

CVE
CVE-2016-6555
Published
Jun 15, 2022
Updated
Sep 17, 2024
Vendor
The OpenNMS Group, Inc.
Product
OpenNMS Horizon
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18.0.1 <=18.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The OpenNMS Group, Inc. · OpenNMS Horizonversion=18.0.1 <=18.0.1

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.1Rapid7, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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