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CVE Record

CVE-2016-6555: OpenNMS Stored XSS via SNMP Trap Alerts

OpenNMS version 18.0.1 and prior are vulnerable to a stored XSS issue due to insufficient filtering of SNMP trap supplied data. By creating a malicious SNMP trap, an attacker can store an XSS payload which will trigger when a user of the web UI views the events list page. This issue was fixed in version 18.0.2, released on September 20, 2016.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

OpenNMS 18.0.1 and earlier can store unsafe content supplied through SNMP trap data. When a web UI user views the events list, that stored content can execute in the browser. The main business risk is compromise of a monitoring console user session or sensitive data visible through that interface.

Executive priority

Treat this as a high-priority legacy exposure if OpenNMS is still running at or below 18.0.1. The fix is old and named, so remediation should focus on confirming upgrade status and reducing untrusted trap input paths.

Technical view

This is a stored cross-site scripting vulnerability in OpenNMS event handling for SNMP trap-supplied data. Insufficient filtering allows attacker-controlled content to be persisted and later rendered on the events list page. The source bundle states it was fixed in OpenNMS 18.0.2, released September 20, 2016.

Likely exposure

Exposure is most likely where OpenNMS 18.0.1 or earlier accepts SNMP traps from untrusted or weakly controlled network sources and users access the web UI events list.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires a malicious SNMP trap to be accepted and a web UI user to view the affected events page, so user interaction is part of the impact path.

Researcher notes

The record maps to CWE-79 with CVSS 3.1 score 7.1. The stated path is stored XSS from SNMP trap data into the events list page. Evidence is sufficient for affected version and fixed version, but not for exploitation in the wild.

Mitigation direction

  • Upgrade OpenNMS to version 18.0.2 or later.
  • Check OpenNMS vendor guidance and release notes for the applicable fixed build.
  • Restrict SNMP trap acceptance to trusted sources only.
  • Limit OpenNMS web UI access to authorized administrators.
  • Review monitoring network segmentation around OpenNMS collectors.

Validation and detection

  • Inventory OpenNMS versions and flag 18.0.1 or earlier.
  • Confirm the OpenNMS 18.0.2 fix or equivalent patch is applied.
  • Review SNMP trap source controls for untrusted senders.
  • Check whether the events list page is exposed to non-administrative users.
  • Review logs for unexpected or suspicious SNMP trap events.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2016-6555 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N2.84.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2016-6555Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
OpenNMSOpenNMS18.0.1Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.