What is the CVSS score of CVE-2026-0640?

CVE-2026-0640 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Ac23 Firmware are affected by CVE-2026-0640?

Organizations using A weakness face significant risk from CVE-2026-0640, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-0640?

Yes, a public proof-of-concept exploit is available for CVE-2026-0640. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-0640?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Ac23 Firmware CVE-2026-0640

HIGH

Buffer Overflow (CWE-119)

2026-01-06 cna@vuldb.com

Buffer Overflow Ac23 Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 15, 2026 - 19:17 vuln.today

Public exploit code

CVE Published

Jan 06, 2026 - 16:15 nvd

HIGH 8.8

DescriptionCVE.org

A weakness has been identified in Tenda AC23 16.03.07.52. This affects the function sscanf of the file /goform/PowerSaveSet. Executing a manipulation of the argument Time can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.

AnalysisAI

Buffer overflow in Tenda AC23 firmware version 16.03.07.52 allows remote attackers with low privileges to achieve complete system compromise through a malformed Time parameter in the /goform/PowerSaveSet function. Public exploit code exists for this vulnerability, creating immediate risk to affected devices. No patch is currently available.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Ac23 Firmware. A weakness has been identified in Tenda AC23 16.03.07.52. This affects the function sscanf of the file /goform/PowerSaveSet. Executing a manipulation of the argument Time can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.