Cyber Resilience

CVE-2025-70646

Memory Safety in Tenda Ax1803 Firmware 1.0.0.1

Public PoCMemory Safety
Published
21 January 2026
Modified
26 January 2026
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 0.0031 24th percentile
Risk Priority 57 floored blend · peak EPSS

Summary

CVE-2025-70646 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Tenda Ax1803 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 24th percentile by exploit likelihood (below the median); 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 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.

CVE-2025-70646 is a stack overflow vulnerability (CWE-121) in the security parameter of the sub_72290 function within Tenda AX1803 firmware version v1.0.0.1. This flaw enables attackers to trigger a Denial of Service (DoS) condition through a specially crafted network request. The vulnerability was publicly disclosed on January 21, 2026, and carries a CVSS v3.1 base score of 7.5, reflecting its high severity due to the potential for remote disruption without authentication.

The attack scenario is straightforward and highly accessible: unauthenticated attackers with network access to the affected device (AV:N/AC:L/PR:N/UI:N) can send a malicious request to the vulnerable function, causing a stack overflow that crashes the device and disrupts service availability (A:H). No user interaction or privileges are required, making it suitable for remote exploitation by any adversary on the same network or exposed to the internet. Successful exploitation results solely in DoS, with no impact on confidentiality or integrity (C:N/I:N).

Mitigation details and further technical analysis are provided in the referenced advisory at https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-1803/5/1.md. Security practitioners should consult this source for reproduction steps, patch information if available, and recommended remediation actions, such as firmware updates or network segmentation.

EU & UK References

Vulnerability Data

Tenda AX1803 v1.0.0.1 was discovered to contain a stack overflow in the security parameter of the sub_72290 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.

CWE(s)
CWE-121

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-2025-70648Same product: Tenda Ax1803
CVE-2025-70651Same product: Tenda Ax1803
CVE-2025-63458Same product: Tenda Ax1803
CVE-2025-7598Same product: Tenda Ax1803
CVE-2025-7597Same product: Tenda Ax1803
CVE-2026-1329Same product: Tenda Ax1803
CVE-2024-4236Same product: Tenda Ax1803
CVE-2024-30621Same product: Tenda Ax1803
CVE-2025-63456Same product: Tenda Ax1803
CVE-2025-63457Same product: Tenda Ax1803

Affected Assets

tenda
ax1803 firmware
1.0.0.1

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 2 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)

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Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and analysis can discover stack-buffer overflows before deployment.

SI-10 Information Input Validation good match

Input validation directly stops untrusted data from exceeding stack buffer bounds.

SI-16 Memory Protection good match

Memory-protection mechanisms limit the ability to execute injected code after a stack overflow.

SA-8 Security and Privacy Engineering Principles partial match

Secure-engineering principles include bounds-checked coding and safe buffer handling that avoid introducing the flaw.

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 prevent introduction of stack buffer overflows.

ID.RA-01 partial match
prevents

Vulnerability scanning can discover stack buffer overflows but does not prevent their introduction.

PR.PS-02 partial match
prevents

Patching eliminates known instances of the weakness after discovery.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing (fuzzing, static analysis) detects stack overflows before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates buffer-safety practices that directly prevent stack overflows.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify buffer-size and input-validation rules.

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

Secure architecture principles include memory-safety and least-privilege stack usage.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid unsafe buffer handling that causes CWE-121.

A.8.32 Change management none match
none

Change-management gates can enforce security reviews that catch buffer issues.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248594 OL 8 must implement address space layout randomization (ASLR) to protect its memory from unauthorized code execution. prevents CWE-121
Oracle Linux 9 (1 rule)
  • V-271452 OL 9 must use a Linux Security Module configured to enforce limits on system services. prevents CWE-121

References