Security readout for executives and security teams
Plain-English summary
TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 may let an unauthenticated attacker delete parental-control rules. This could silently remove intended browsing restrictions. The CVE is rated critical, although the supplied record does not establish real-world exploitation or identify a confirmed patched release.
Executive priority
Prioritize immediate exposure reduction for affected routers, especially internet-accessible devices. Assign owners to inventory firmware, restrict management access, and obtain confirmed vendor remediation. The business impact centers on unauthorized removal of safety controls; the CVSS record also claims high confidentiality and integrity impact, but the supplied description does not explain those broader effects.
Technical view
The delParentalRules function reportedly lacks correct access control. A crafted POST request to the router’s CGI endpoint can remove parental-control rules without authentication. The record assigns CWE-284 and CVSS 3.1 score 9.1, with network reachability, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is limited to TOTOLINK T6 devices running the specifically named firmware. Risk is greatest where the affected management CGI endpoint is reachable from the internet or another untrusted network. The structured affected-product fields are listed as unavailable, so broader version impact cannot be determined.
Exploitation context
The supplied sources describe an unauthenticated, remotely reachable attack condition. However, the CVE is not listed as KEV, and the bundle provides no evidence of active exploitation, public weaponization, or observed attacks. Treat exploit status as unconfirmed.
Researcher notes
The record names one T6 firmware build and CWE-284, but its structured affected fields contain only unavailable values. The described outcome is deletion of parental-control rules, while the CVSS vector claims high confidentiality and integrity impact. No patch version, vendor advisory confirmation, or exploitation evidence is supplied; these gaps warrant cautious interpretation.
Mitigation direction
- Inventory TOTOLINK T6 devices and identify those running firmware 4.1.5cu.748_B20211015.
- Prevent router management interfaces from being reachable from the internet or untrusted networks.
- Restrict management access to trusted administrators and dedicated management networks.
- Check TOTOLINK guidance for a confirmed fixed firmware or vendor-recommended mitigation.
- After remediation, review and restore required parental-control rules.
Validation and detection
- Confirm each device model and installed firmware through trusted administrative records or its management interface.
- Verify the management CGI endpoint is inaccessible from internet and untrusted network segments.
- Review parental-control configurations for missing or unexpectedly changed rules.
- Check device and network logs for unexplained management requests, where logging is available.
- Confirm any installed replacement firmware is explicitly identified by TOTOLINK as addressing this CVE.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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.
Open ATT&CK lookupCVE-2026-51726 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
SSVC decision data
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N3.95.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.htmlCVE reference, mitre
- https://www.totolink.net/CVE reference, mitre
- https://github.com/DarkBoulder/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.mdCVE reference, mitre
- https://github.com/ShengWu00/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.mdCVE reference, mitre
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.