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CVE Record

CVE-2021-32541: SysJust CTS Web - Broken Access Control

The CTS Web transaction system related to authentication and session management is implemented incorrectly, which allows remote unauthenticated attackers can send a large number of valid usernames, and force those logged-in account to log out, causing the user to be unable to access the services

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

SysJust CTS Web has an authentication and session management flaw that can let an unauthenticated remote attacker log active users out by submitting many valid usernames. The documented impact is service disruption, not data theft or account takeover, based on the supplied sources.

Executive priority

Treat this as a moderate availability risk. It is most urgent where CTS Web supports customer-facing, revenue-impacting, or operationally critical access, because attackers may disrupt legitimate users without authentication.

Technical view

CVE-2021-32541 is a remotely reachable broken access control issue in SysJust CTS Web. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, reflecting unauthenticated network access with low availability impact. Affected versions are unspecified in the source bundle.

Likely exposure

Exposure is limited to organizations running SysJust CTS Web, especially where the CTS Web authentication or session workflow is reachable from untrusted networks. The source bundle does not identify affected versions, deployment patterns, or CPEs.

Exploitation context

The source bundle says an unauthenticated remote attacker can force logged-in accounts to log out by sending many valid usernames. KEV is false, and the supplied sources do not provide evidence of active exploitation.

Researcher notes

Evidence is incomplete. The bundle does not list CWE, affected version ranges, patch versions, product CPEs, or specific vendor mitigations. Avoid broad product assumptions and validate scope directly against vendor or advisory data.

Mitigation direction

  • Check SysJust, TWCERT, and CHT Security guidance for vendor remediation.
  • Reduce untrusted network access to CTS Web authentication surfaces.
  • Monitor for unusual logout spikes or repeated username-related session events.
  • Prioritize compensating controls if CTS Web supports critical business services.

Validation and detection

  • Inventory whether SysJust CTS Web is deployed in your environment.
  • Confirm whether CTS Web is reachable from the internet or partner networks.
  • Review authentication and session logs for abnormal forced logout patterns.
  • Verify vendor-advised fixed versions or mitigations 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

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CVE-2021-32541 mapping review

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

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

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

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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-32541Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
SysJustCTS WebunspecifiedListed
Weakness

CWE details

No CWE listed

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