EUVD-2026-68677
GHSA-w22m-c6jj-354c
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated low-complexity network request (AV:N/AC:L/PR:N/UI:N), but the action only deletes DHCP reservations, so no confidentiality impact and limited config-integrity and availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the delStaticDhcpRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove static DHCP reservations via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers delete static DHCP reservations without authentication by sending a crafted POST request to the delStaticDhcpRules handler in /cgi-bin/cstecgi.cgi. The affected endpoint fails to enforce access control (CWE-284), so any attacker who can reach the device's web management interface can invoke the function. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6 web management endpoint /cgi-bin/cstecgi.cgi and the ability to send a crafted POST invoking the delStaticDhcpRules function; per the CVSS vector (PR:N/UI:N) no authentication and no user interaction are needed against firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) correctly reflects that no authentication or user interaction is needed and the attack is low-complexity, but the C:H/I:H/A:H impact metrics that drive the 9.8 score are questionable: the described action only removes static DHCP reservations, which is a configuration-integrity and minor-availability issue rather than a confidentiality breach or full device compromise - CVSS indicates total impact but the description implies a narrowly scoped effect, so verify with the vendor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version is identified at time of analysis; the references point to TOTOLINK's site and third-party vulnerability-coordination pages rather than a tagged fixed firmware, so administrators should check the TOTOLINK download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated T6 firmware build newer than 4.1.5cu.748_B20211015 and apply it once released. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit your environment to identify all TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 and immediately disable remote web-based management (disable WAN access on port 80/443) and restrict local management to trusted internal networks via firewall rules. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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