Tenda AC20 up to 16.03.08.12 saveParentControlInfo strcpy Time buffer overflow

Summaryinfo

A vulnerability has been found in Tenda AC20 up to 16.03.08.12 and classified as critical. Affected by this issue is the function strcpy of the file /goform/saveParentControlInfo. This manipulation of the argument Time causes buffer overflow. This vulnerability appears as CVE-2025-8940. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability was found in Tenda AC20 up to 16.03.08.12. It has been declared as critical. Affected by this vulnerability is the function strcpy of the file /goform/saveParentControlInfo. The manipulation of the argument time with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-8940. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/13/2025 Advisory disclosed
08/13/2025 +0 days VulDB entry created
08/15/2025 +2 days VulDB entry last update

Sourcesinfo

Vendor: tenda.com.cn

Advisory: github.com
Status: Not defined

CVE: CVE-2025-8940 (🔒)
GCVE (CVE): GCVE-0-2025-8940
GCVE (VulDB): GCVE-100-319903
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/13/2025 14:06
Updated: 08/15/2025 17:10
Changes: 08/13/2025 14:06 (57), 08/14/2025 13:16 (31), 08/15/2025 17:10 (1)
Complete: 🔍
Submitter: QMSSDXN
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #631836: Tenda AC20 ≤ V16.03.08.12 (latest version) Buffer Overflow (by QMSSDXN)

Be aware that VulDB is the high quality source for vulnerability data.

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