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ID

VAR-202508-0674


CVE

CVE-2025-8940


TITLE

Tenda AC20 Buffer Overflow Vulnerability (CNVD-2025-19580)

Trust: 0.6

sources: CNVD: CNVD-2025-19580

DESCRIPTION

A vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this vulnerability is the function strcpy of the file /goform/saveParentControlInfo. The manipulation of the argument Time leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The Tenda AC20 is a wireless router from the Chinese company Tenda. The Tenda AC20 suffers from a buffer overflow vulnerability caused by a failure to properly validate the length of input data in the "Time" parameter in the file /goform/saveParentControlInfo. This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service (DoS)

Trust: 1.44

sources: NVD: CVE-2025-8940 // CNVD: CNVD-2025-19580

IOT TAXONOMY

category:['Network device']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2025-19580

AFFECTED PRODUCTS

vendor:tendamodel:ac20scope:gteversion:16.03.08.0

Trust: 1.0

vendor:tendamodel:ac20scope:lteversion:16.03.08.12

Trust: 1.0

vendor:jixiang tengdamodel:ac20scope:lteversion:<=16.03.08.12

Trust: 0.6

sources: CNVD: CNVD-2025-19580 // NVD: CVE-2025-8940

CVSS

SEVERITY

CVSSV2

CVSSV3

cna@vuldb.com: CVE-2025-8940
value: HIGH

Trust: 1.0

CNVD: CNVD-2025-19580
value: HIGH

Trust: 0.6

cna@vuldb.com: CVE-2025-8940
severity: HIGH
baseScore: 9.0
vectorString: AV:N/AC:L/AU:S/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: SINGLE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 8.0
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.0

CNVD: CNVD-2025-19580
severity: HIGH
baseScore: 9.0
vectorString: AV:N/AC:L/AU:S/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: SINGLE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 8.0
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

cna@vuldb.com: CVE-2025-8940
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.1

Trust: 1.0

sources: CNVD: CNVD-2025-19580 // NVD: CVE-2025-8940

PROBLEMTYPE DATA

problemtype:CWE-119

Trust: 1.0

problemtype:CWE-120

Trust: 1.0

sources: NVD: CVE-2025-8940

EXTERNAL IDS

db:NVDid:CVE-2025-8940

Trust: 1.6

db:VULDBid:319903

Trust: 1.0

db:CNVDid:CNVD-2025-19580

Trust: 0.6

sources: CNVD: CNVD-2025-19580 // NVD: CVE-2025-8940

REFERENCES

url:https://vuldb.com/?ctiid.319903

Trust: 1.0

url:https://github.com/lin-3-start/lin-cve/blob/main/tenda%20ac20-2/tenda%20ac20-2.md#poc

Trust: 1.0

url:https://vuldb.com/?submit.631836

Trust: 1.0

url:https://github.com/lin-3-start/lin-cve/blob/main/tenda%20ac20-2/tenda%20ac20-2.md

Trust: 1.0

url:https://www.tenda.com.cn/

Trust: 1.0

url:https://vuldb.com/?id.319903

Trust: 1.0

url:https://nvd.nist.gov/vuln/detail/cve-2025-8940

Trust: 0.6

sources: CNVD: CNVD-2025-19580 // NVD: CVE-2025-8940

SOURCES

db:CNVDid:CNVD-2025-19580
db:NVDid:CVE-2025-8940

LAST UPDATE DATE

2025-08-29T23:24:28.189000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2025-19580date:2025-08-28T00:00:00
db:NVDid:CVE-2025-8940date:2025-08-19T18:42:24.900

SOURCES RELEASE DATE

db:CNVDid:CNVD-2025-19580date:2025-08-28T00:00:00
db:NVDid:CVE-2025-8940date:2025-08-14T06:15:29.180