Security readout for executives and security teams
Plain-English summary
This CVE describes a hardcoded Telnet password in TOTOLINK CP900L firmware v4.1.5cu.798_B20221228. If Telnet is reachable, an attacker could log in as root without needing a user account, giving full device control. The sources do not identify a vendor patch or confirmed real-world exploitation.
Executive priority
Treat this as urgent for any deployed CP900L device with reachable Telnet. Root access to a router-class device can support traffic interception, persistence, service disruption, and lateral movement. Prioritize internet-facing or remotely managed devices first.
Technical view
The report places a hardcoded Telnet credential in /web_cste/cgi-bin/product.ini and says it allows root login. The CVSS 3.1 score is 9.8 because exploitation is network-accessible, low complexity, unauthenticated, and can fully impact confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely where TOTOLINK CP900L devices running v4.1.5cu.798_B20221228 have Telnet enabled or reachable from untrusted networks. The structured affected-product fields are incomplete, so confirm against asset inventory and firmware details.
Exploitation context
CISA KEV is false in the provided bundle, and no cited source confirms active exploitation. However, the described issue is severe because it involves root login through a hardcoded Telnet password when the service is accessible.
Researcher notes
Evidence is limited to the CVE record and a public vulnerability report. The CVE uses CWE-284 and lists affected vendor/product fields as n/a, while the description names TOTOLINK CP900L firmware v4.1.5cu.798_B20221228. Do not assume broader model impact without vendor confirmation.
Mitigation direction
- Check TOTOLINK guidance for fixed firmware or replacement advice.
- Disable Telnet if supported on affected devices.
- Block Telnet from the internet and untrusted internal networks.
- Restrict management access to trusted admin networks or VPN only.
- Retire or isolate devices if no vendor remediation is available.
Validation and detection
- Identify all TOTOLINK CP900L devices in inventory.
- Confirm firmware version v4.1.5cu.798_B20221228 or nearby builds.
- Verify whether Telnet is enabled and reachable.
- Review firewall rules for exposed device management services.
- Track vendor advisories for remediation status.
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 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-2024-35396 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.
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:H3.95.9CISA-ADPVulnerability 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
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://github.com/s4ndw1ch136/IOT-vuln-reports/blob/main/TOTOLINK%20CP900L/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.