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CVE Record

CVE-2017-20113: TrueConf Server Stored cross site scripting

A vulnerability, which was classified as problematic, was found in TrueConf Server 4.3.7. This affects an unknown part. The manipulation leads to basic cross site scripting (Stored). It is possible to initiate the attack 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

TrueConf Server 4.3.7 has a stored cross-site scripting issue. An authenticated remote attacker could store malicious content that affects another user when viewed. The business impact appears limited to integrity of user interactions, with no source evidence of data theft, outage, or active exploitation.

Executive priority

Handle through normal vulnerability management. Prioritize if the service is internet-facing, used by many untrusted accounts, or supports sensitive meetings. It is not an emergency based on the provided sources.

Technical view

CVE-2017-20113 is a CWE-80 stored XSS vulnerability in TrueConf Server 4.3.7. CVSS 3.1 is 3.5: network reachable, low complexity, low privileges required, user interaction required, unchanged scope, low integrity impact only. The affected component is not identified in the source bundle.

Likely exposure

Exposure is likely limited to organizations still running TrueConf Server 4.3.7, especially where authenticated users can submit content later viewed by others. Public-facing deployments increase reach, but exploitation still requires privileges and victim interaction.

Exploitation context

The source bundle states public exploit disclosure and possible use. CISA KEV is false, and no cited source confirms active exploitation. Treat this as publicly documented but not known exploited from the provided evidence.

Researcher notes

Evidence is sparse: the vulnerable component is unknown and no official fix is named in the bundle. The Exploit-DB and VulDB references support public disclosure, while CVE metadata constrains impact to stored XSS with low integrity impact.

Mitigation direction

  • Identify any TrueConf Server 4.3.7 deployments.
  • Check TrueConf vendor guidance for fixed versions or official remediation.
  • Reduce access to trusted authenticated users only.
  • Restrict external exposure where business use permits.
  • Monitor for suspicious stored HTML or script-like content.

Validation and detection

  • Confirm product and version on every TrueConf Server instance.
  • Verify whether affected instances are internet reachable.
  • Review user roles with content submission permissions.
  • Check recent logs for unusual stored content changes.
  • Confirm vendor remediation status before closing the finding.
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

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-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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2017-20113 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-2017-20113Attack 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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