Cyber Resilience

CVE-2025-28220

Memory Safety in Tenda W6-S Firmware 1.0.0.4\(510\)

Memory Safety
Published
28 March 2025
Modified
06 May 2025
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0045 37th percentile
Risk Priority 62 floored blend · peak EPSS

Summary

CVE-2025-28220 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Tenda W6-S Firmware. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 37th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — 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.

Tenda W6_S v1.0.0.4_510 contains a buffer overflow vulnerability in the setcfm function, tracked as CVE-2025-28220 and assigned CWE-120. The flaw resides in the device's web server binary and is triggered when the funcpara1 parameter is supplied in a POST request, allowing an unauthenticated remote attacker to supply malformed input that corrupts memory and terminates the web server process. The issue carries a CVSS 3.1 base score of 7.5, reflecting network attack vector, low complexity, and high availability impact with no confidentiality or integrity consequences.

An attacker with network access to the device can send a crafted POST request containing an oversized or malformed funcpara1 value directly to the setcfm endpoint. Successful exploitation results only in a denial-of-service condition that crashes the web server; no further code execution or data access has been demonstrated in the available details.

The single reference is a technical write-up hosted on GitHub that reproduces the crash but provides no vendor advisory, firmware update, or mitigation guidance. The associated EPSS score remains low, moving only from 0.0197 to a peak of 0.0268, indicating limited observed exploitation interest to date.

EU & UK References

Vulnerability Data

Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the setcfm function, which allows remote attackers to cause web server crash via parameter funcpara1 passed to the binary through a POST request.

CWE(s)
CWE-120

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-28221Same product: Tenda W6-S
CVE-2025-15255Same product: Tenda W6-S
CVE-2025-15254Same product: Tenda W6-S
CVE-2023-27061Same vendor: Tenda
CVE-2025-60343Same vendor: Tenda
CVE-2025-60340Same vendor: Tenda
CVE-2025-67073Same vendor: Tenda
CVE-2025-29361Same vendor: Tenda
CVE-2025-55499Same vendor: Tenda
CVE-2024-7585Same vendor: Tenda

Affected Assets

tenda
w6-s firmware
1.0.0.4\(510\)

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V5.2.1

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and analysis can find missing size checks before deployment.

SI-10 Information Input Validation good match

Input validation directly enforces size checks before buffer copies.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles require bounds checking and safe buffer handling in design.

SI-16 Memory Protection partial match

Memory protection limits the impact of an overflow once it occurs.

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.

PR.PS-06 mostly match
prevents

Secure development practices directly enforce bounds checking and input validation that prevent classic buffer overflows.

ID.RA-01 partial match
prevents

Vulnerability identification processes such as code review or scanning detect classic buffer overflows before exploitation.

PR.PS-02 partial match
prevents

Routine patching replaces vulnerable code containing unchecked buffer copies with corrected versions.

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.

A.8.28 Secure coding mostly match
prevents

Secure coding directly requires bounds-checked memory operations, addressing the root cause of CWE-120.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development and acceptance can detect buffer overflows through fuzzing and static analysis, though it does not prevent them at the source.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates processes that can include input validation and bounds checking to prevent buffer overflows.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify input-size validation and safe buffer handling to mitigate classic buffer overflows.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture and engineering principles promote defensive coding patterns that reduce the likelihood of unchecked buffer copies.

References