CVE-2025-60335
Memory Safety in Totolink N600R Firmware 4.3.0cu.7866_b20220506
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSummary
CVE-2025-60335 is a high-severity NULL Pointer Dereference (CWE-476) vulnerability in Totolink N600R Firmware. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked in the top 21% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
A NULL pointer dereference vulnerability exists in the main function of the TOTOLINK N600R router running firmware version v4.3.0cu.7866_B20220506. The flaw, tracked as CWE-476, is triggered when the device processes a specially crafted HTTP request, resulting in a crash that produces a denial-of-service condition. The issue carries a CVSS 3.1 base score of 7.5, reflecting network attack vector, low complexity, and no required authentication or user interaction.
An unauthenticated remote attacker can exploit the weakness by sending a single malicious HTTP request to an exposed management interface. Successful exploitation terminates the affected process, rendering the router unresponsive until it is restarted and thereby disrupting network connectivity for all connected clients.
The associated EPSS score began at a low value, rose to a peak of 0.0266 on 2026-02-23, and has since declined to the current level of 0.0089, indicating a temporary increase in exploitation interest after public disclosure. Public references consist of proof-of-concept material hosted on GitHub; no vendor advisory or patch information is provided in the available sources.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-35585
Vulnerability Data
A NULL pointer dereference in the main function of TOTOLINK N600R v4.3.0cu.7866_B20220506 allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation (including static analysis) directly finds null-dereference bugs before deployment.
Documented development standards and tools can enforce null-safety rules and safe pointer usage.
Engineering principles can mandate defensive coding such as explicit null checks before dereference.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices (static analysis, code review, safe coding standards) directly prevent NULL dereference bugs during development.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect NULL dereference defects before release.
Secure SDLC mandates defensive coding practices that can prevent NULL dereferences.
Application security requirements can specify input validation and pointer-safety rules.
Secure architecture principles encourage defensive design that avoids unsafe pointer use.
Secure coding standards directly require NULL-pointer checks and safe dereference patterns.