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CVE Record

CVE-2017-20118: TrueConf Server DOM cross site scripting

A vulnerability was found in TrueConf Server 4.3.7. It has been rated as problematic. Affected by this issue is some unknown functionality of the file /admin/conferences/list/. The manipulation of the argument domxss leads to basic cross site scripting (DOM). The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

LowCVSS 3.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2017-20118 is a low-severity DOM cross-site scripting issue in TrueConf Server 4.3.7. It affects an admin conference-list page parameter. Business impact is limited but real: an authenticated user could influence browser-side content if a victim interacts with crafted input.

Executive priority

Handle through normal vulnerability management unless the affected admin interface is broadly reachable or the product remains unsupported. The issue is public but low impact and not KEV-listed.

Technical view

The CVE describes DOM XSS in TrueConf Server 4.3.7 at /admin/conferences/list/ via the domxss argument. CVSS 3.1 is 3.5: network reachable, low complexity, low privileges required, user interaction required, integrity impact only.

Likely exposure

Exposure is most likely limited to organizations still running TrueConf Server 4.3.7, especially where administrative web paths are reachable by authenticated users beyond a tightly controlled admin group.

Exploitation context

The source bundle says exploit details were publicly disclosed and may be used. CISA KEV is false, and no cited source confirms active exploitation in the wild.

Researcher notes

Evidence is narrow: affected version 4.3.7, DOM XSS, admin conference-list path, domxss argument, public exploit disclosure, and CVSS 3.5. The bundle does not name a fixed version, vendor advisory, or confirmed exploitation.

Mitigation direction

  • Inventory TrueConf Server instances and identify any running version 4.3.7.
  • Check TrueConf guidance for fixed versions or vendor-recommended remediation.
  • Restrict administrative interface access to trusted networks and required administrators.
  • Prioritize upgrade or replacement for exposed 4.3.7 deployments.
  • Monitor administrative web logs for unusual domxss parameter activity.

Validation and detection

  • Confirm product and version on each TrueConf Server deployment.
  • Review whether /admin/conferences/list/ is reachable from untrusted networks.
  • Verify administrative access requires authentication and least-privilege roles.
  • Check patch or upgrade status against current TrueConf guidance.
  • Review logs for suspicious requests involving the domxss argument.
Prepared
Confidence
medium
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

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cwe · medium confidence lookup

CWE-80: 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.

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cve · low confidence lookup

CVE-2017-20118 mapping review

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
3.5CVSS 3.1LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N2.11.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

3.5Low
CVSS 3.1 vector shape for CVE-2017-20118Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
TrueConfServer4.3.7Listed
Weakness

CWE details

CWE-80

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

CWE-80 · source CWE mapping

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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