Security readout for executives and security teams
Plain-English summary
CVE-2024-35398 is a critical memory-safety flaw reported in TOTOLINK CP900L firmware v4.1.5cu.798_B20221228. A malformed desc value in MAC filter rule handling can overflow a stack buffer. The CVSS rating indicates possible remote, unauthenticated compromise, but the supplied sources do not confirm active exploitation or a vendor fix.
Executive priority
Treat this as urgent for any internet-reachable or business-critical CP900L deployment. The vulnerability is rated critical and may allow full compromise, but current supplied evidence does not prove exploitation in the wild or identify a confirmed patch.
Technical view
The issue is described as CWE-120 stack-based buffer overflow in setMacFilterRules, triggered through the desc parameter. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, scoring 9.8. Public evidence identifies the affected firmware build, but not confirmed patched versions, exploit-in-the-wild activity, or authoritative vendor remediation.
Likely exposure
Likely exposure is TOTOLINK CP900L devices running firmware v4.1.5cu.798_B20221228, especially where the management interface is reachable from untrusted networks. The source bundle does not provide CPEs or broader affected-version ranges.
Exploitation context
The CVSS vector supports remote, low-complexity, unauthenticated exploitation with no user interaction. CISA KEV is false in the supplied data, and no cited source confirms active exploitation. Public vulnerability details exist, so defenders should assume heightened scanning interest.
Researcher notes
The public record names setMacFilterRules and the desc parameter, with CWE-120 and CVSS 9.8. Affected metadata is incomplete in the bundle, listing n/a for vendor and product despite the description naming TOTOLINK CP900L. Avoid assuming adjacent TOTOLINK models are affected without evidence.
Mitigation direction
- Inventory TOTOLINK CP900L devices and confirm firmware versions.
- Restrict management access to trusted administrative networks only.
- Check TOTOLINK guidance for fixed firmware or replacement advice.
- If no fix exists, isolate or retire affected devices.
- Monitor for unexpected configuration changes or device instability.
Validation and detection
- Confirm whether CP900L firmware v4.1.5cu.798_B20221228 is present.
- Verify admin interfaces are not internet-exposed.
- Review firewall rules limiting router management access.
- Check vendor advisories for any fixed build or workaround.
- Document compensating controls for any unpatched device.
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-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2024-35398 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/setMacFilterRules/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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.