Security readout for executives and security teams
Plain-English summary
A missing access-control check in a TOTOLINK T6 router function may let an unauthenticated network attacker alter WAN dial settings. This could disrupt or redirect network connectivity and may expose sensitive configuration. The supplied record identifies firmware 4.1.5cu.748_B20211015, but does not establish broader version impact or internet exposure.
Executive priority
Prioritize immediate identification and containment of affected routers, especially at internet-facing or business-critical sites. Because no confirmed patch is named in the supplied sources, require vendor-guidance review and track remediation to closure.
Technical view
CVE-2026-51713 affects setManualDialCfg in TOTOLINK T6 firmware 4.1.5cu.748_B20211015. A crafted POST request to /cgi-bin/cstecgi.cgi can manipulate WAN dial state without authentication. It is classified CWE-284 with CVSS 3.1 score 9.1: network-accessible, low complexity, no privileges, no user interaction, and high confidentiality and integrity impact.
Likely exposure
Exposure is highest where an affected router's management service is reachable from untrusted networks. The supplied sources do not confirm whether the endpoint is normally LAN-only, remotely exposed, or enabled by default. Inventory and configuration review are therefore necessary.
Exploitation context
The supplied bundle does not identify active exploitation, and the CVE is not listed as KEV. Public coordination references exist, but they do not establish exploitation prevalence. Treat the flaw as readily reachable when the vulnerable management endpoint is network-accessible.
Researcher notes
The record describes unauthenticated access to setManualDialCfg through a shared CGI endpoint. Scope should remain limited to the named T6 firmware until vendor or CVE data confirms additional versions. Patch availability, default reachability, affected configurations, and observed exploitation remain unconfirmed in the supplied evidence.
Mitigation direction
- Identify TOTOLINK T6 devices running firmware 4.1.5cu.748_B20211015.
- Check TOTOLINK guidance for a confirmed fixed firmware release or supported remediation.
- Prevent router management access from the internet and other untrusted networks.
- Restrict management access to authorized administrative hosts or a dedicated management network.
- Monitor WAN configuration and connectivity for unexpected changes.
Validation and detection
- Confirm each device model and exact installed firmware version.
- Verify the management interface is unreachable from untrusted network segments.
- Review WAN dial settings against approved configuration baselines.
- Inspect available router and network logs for unexplained configuration or connectivity changes.
- After remediation, recheck firmware versions and management-access restrictions.
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-2026-51713 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.
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.