Security readout for executives and security teams
Plain-English summary
CVE-2023-24155 is a critical hardcoded password issue reported in TOTOLINK T8 V4.1.5cu. If telnet is reachable, an attacker may be able to use the built-in credential to access the device. That can put network confidentiality, integrity, and availability at risk.
Executive priority
Treat as urgent for any deployed TOTOLINK T8 V4.1.5cu device, especially internet-exposed routers. Prioritize exposure reduction immediately while confirming vendor remediation options.
Technical view
The CVE describes CWE-798: a hardcoded password for the telnet service stored in /web_cste/cgi-bin/product.ini. CVSS 3.1 is 9.8 with network access, low complexity, no privileges, and no user interaction. The public bundle identifies TOTOLINK T8 V4.1.5cu, but structured affected product metadata is incomplete.
Likely exposure
Exposure is most likely where TOTOLINK T8 V4.1.5cu devices have telnet enabled or reachable from untrusted networks. The bundle does not establish affected versions beyond V4.1.5cu.
Exploitation context
No CISA KEV entry is indicated, and the supplied sources do not claim active exploitation. Risk remains high because the CVSS vector indicates unauthenticated network access with high confidentiality, integrity, and availability impact.
Researcher notes
Evidence supports a hardcoded telnet credential issue in a specific firmware version. The CVE record lacks normalized vendor, product, version, and CPE data, so asset matching may require manual inventory and firmware verification.
Mitigation direction
- Check TOTOLINK guidance for firmware updates or official remediation.
- Disable telnet management where possible.
- Block telnet from the internet and untrusted networks.
- Restrict device administration to trusted management networks or VPN.
- Replace or retire devices if no supported fix exists.
Validation and detection
- Inventory TOTOLINK T8 devices and firmware versions.
- Confirm whether any device runs V4.1.5cu.
- Check whether telnet is enabled or externally reachable.
- Review firewall and remote-management exposure.
- Review device logs for unexpected management access.
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-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-24155 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
- 9.8 (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:H
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.
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:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.