Cyber Resilience

CVE-2025-70221

CriticalPublic PoC

Published: 04 March 2026

Published
04 March 2026
Modified
06 March 2026
KEV Added
—
Patch
—
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0049 38.0th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2025-70221 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Dlink Dir-513 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.0th 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 are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).

Deeper analysis

CVE-2025-70221 is a stack buffer overflow vulnerability (CWE-121) affecting the D-Link DIR-513 router in version 1.10. The issue arises in the handling of the curTime parameter sent to the goform/formLogin endpoint, allowing attackers to trigger a buffer overflow condition. Published on 2026-03-04, it carries a CVSS v3.1 base score of 9.8, reflecting its critical severity due to network accessibility, low attack complexity, and no requirements for privileges or user interaction.

The vulnerability can be exploited remotely by unauthenticated attackers over the network with no privileges required. Successful exploitation enables high-impact outcomes, including arbitrary code execution, data disclosure, modification of system integrity, and denial of service, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Mitigation details and advisories are available through vendor resources, including the D-Link security bulletin at https://www.dlink.com/en/security-bulletin/, product support page at https://www.dlink.com.cn/techsupport/ProductInfo.aspx?m=DIR-513, and a GitHub CVE report at https://github.com/akuma-QAQ/CVEreport/tree/main/D-link/CVE-2025-70221. Security practitioners should consult these for patch availability and recommended actions specific to the DIR-513.

EU & UK References

Vulnerability details

Stack buffer overflow vulnerability in D-Link DIR-513 v1.10 via the curTime parameter to goform/formLogin.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

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 →
Why these techniques?

Stack buffer overflow in public-facing router web endpoint (goform/formLogin) allows remote unauthenticated exploitation for arbitrary code execution, directly mapping to T1190: Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-70218Same product: Dlink Dir-513
CVE-2025-70233Same product: Dlink Dir-513
CVE-2025-70244Same product: Dlink Dir-513
CVE-2025-70232Same product: Dlink Dir-513
CVE-2025-70230Same product: Dlink Dir-513
CVE-2025-70219Same product: Dlink Dir-513
CVE-2025-70242Same product: Dlink Dir-513
CVE-2025-70223Same product: Dlink Dir-513
CVE-2025-70225Same product: Dlink Dir-513
CVE-2025-70229Same product: Dlink Dir-513

Affected Assets

dlink
dir-513 firmware
1.10

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly prevents stack buffer overflow by requiring validation of the curTime parameter in the goform/formLogin endpoint.

SI-16 Memory Protection good match
prevent

Mitigates exploitation of the stack buffer overflow through memory safeguards such as stack canaries and non-executable stacks.

SI-2 Flaw Remediation good match
prevent

Addresses the CVE by mandating timely remediation via vendor patches for the D-Link DIR-513 v1.10 firmware vulnerability.

References