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CVE Record

CVE-2017-20119: TrueConf Server change-lang redirect

A vulnerability classified as problematic has been found in TrueConf Server 4.3.7. This affects an unknown part of the file /admin/general/change-lang. The manipulation of the argument redirect_url leads to open redirect. 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

CVE-2017-20119 is a low-severity open redirect in TrueConf Server 4.3.7. A logged-in user could influence a redirect parameter in an admin language-change path, potentially sending another user to an untrusted site. The main business risk is phishing support, not direct server takeover.

Executive priority

Treat as a low-priority remediation unless TrueConf admin access is broadly exposed. Address during routine patching and hardening, with higher urgency if the admin interface is internet-accessible.

Technical view

The issue affects /admin/general/change-lang in TrueConf Server 4.3.7. Manipulating redirect_url can cause an open redirect, mapped to CWE-601. CVSS 3.1 is 3.5 with network access, low complexity, low privileges required, and user interaction required.

Likely exposure

Exposure is limited to organizations running TrueConf Server 4.3.7, especially where administrative interfaces are reachable by users or networks beyond a tightly controlled admin group.

Exploitation context

The bundle states public exploit disclosure and possible use. It does not identify active exploitation, and KEV status is false, so active exploitation should not be assumed.

Researcher notes

Evidence identifies the affected version, endpoint, parameter, CWE, and CVSS vector. The vulnerable code area is described as unknown, and the bundle provides no vendor-confirmed patch details, so remediation should be verified against TrueConf guidance.

Mitigation direction

  • Inventory TrueConf Server instances and identify any running version 4.3.7.
  • Check TrueConf guidance or release notes for an applicable fix or upgrade path.
  • Restrict administrative interface access to trusted networks and authorized users.
  • Ensure redirects from admin workflows are limited to approved internal destinations.
  • Monitor for suspicious change-lang redirect_url activity in web logs.

Validation and detection

  • Confirm whether TrueConf Server 4.3.7 is present in asset inventory.
  • Identify whether /admin/general/change-lang is reachable from untrusted networks.
  • Review access logs for unusual redirect_url destinations tied to admin paths.
  • In a controlled test, verify redirects are constrained to trusted internal paths.
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-601: 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-2017-20119 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
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-2017-20119Attack 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-601

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

CWE-601 · source CWE mapping

URL Redirection to Untrusted Site ('Open Redirect')

URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs