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CVE Record

CVE-2026-51643: Incorrect access control in the getNtpCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthentica...

Incorrect access control in the getNtpCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain NTP configuration and current time data via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CriticalCVSS 9.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A flaw in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 may let an unauthenticated network attacker retrieve the router's NTP settings and current-time data. The request requires no user interaction or credentials. Public information does not establish whether management access is exposed by default or whether additional data or changes are possible.

Executive priority

Treat this as an urgent exposure-management issue: locate affected routers quickly and isolate their management interfaces. Prioritize Internet-reachable devices. The critical score warrants prompt action, but current evidence does not justify claiming compromise or active exploitation. Plan firmware remediation or device replacement after confirming vendor support.

Technical view

The getNtpCfg function exposed through /cgi-bin/cstecgi.cgi has incorrect access control. A crafted POST request can obtain NTP configuration and current-time data without authentication. The supplied CVSS 3.1 score is 9.1. Its high integrity impact is not explained by the published description, which documents disclosure only.

Likely exposure

Confirmed scope is TOTOLINK T6 firmware 4.1.5cu.748_B20211015. Risk is greatest when the CGI management interface is reachable from the Internet or another untrusted network. The supplied affected-product metadata is otherwise incomplete, so other models and versions should not be assumed vulnerable.

Exploitation context

The vulnerability is remotely reachable, low complexity, requires no privileges, and needs no user interaction according to the supplied CVSS vector. It is not listed as KEV in the bundle, and the cited material provides no evidence of active exploitation. Public coordination repositories may increase researcher awareness but do not establish exploitation.

Researcher notes

CWE-284 fits the reported authentication failure. The description supports unauthorized configuration disclosure, while the CVSS vector claims high confidentiality and integrity impact with no availability impact. Because the integrity consequence, broader response contents, default reachability, patch status, and affected-version range are not documented, avoid extending conclusions beyond the named T6 build.

Mitigation direction

  • Inventory TOTOLINK T6 devices and identify those running firmware 4.1.5cu.748_B20211015.
  • Block management and CGI access from the Internet and other untrusted networks.
  • Restrict administration to trusted management networks or an authenticated remote-access layer.
  • Check TOTOLINK guidance for corrected firmware; no confirmed patch is identified in the supplied sources.
  • Monitor the affected endpoint while replacement or vendor-supported remediation is pending.

Validation and detection

  • Confirm device model and exact firmware version through approved inventory or administration records.
  • Determine whether /cgi-bin/cstecgi.cgi is reachable from Internet-facing or untrusted network segments.
  • Verify network controls restrict router management access to authorized administrative sources.
  • Review available web or gateway logs for unexpected POST requests to the affected CGI endpoint.
  • Recheck TOTOLINK's download page and CVE record for updated remediation guidance.
Prepared
Confidence
medium
Sources
6

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-284: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2026-51643 mapping review

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Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
3Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total

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
9.1CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N3.95.2CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

9.1Critical
CVSS 3.1 vector shape for CVE-2026-51643Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

CWE-284

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

CWE-284 · source CWE mapping

CWE mapping pending import

This CVE carries a CWE mapping that will resolve to a full Glexia CWE intelligence page after the official CWE import is complete.

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