High severity · published Mar 7, 2026
CVE-2026-3678
Tenda FH451 AdvSetWan sub_3C434 stack-based overflow
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
A vulnerability was determined in Tenda FH451 1.0.0.9. Affected is the function sub_3C434 of the file /goform/AdvSetWan. This manipulation of the argument wanmode/PPPOEPassword causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FH
FH451 · Tenda
1.0.0.9 · source: vendor
FF
Fh451 Firmware · Tenda
1.0.0.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3678
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3678
Exploit
https://github.com/Litengzheng/vul_db/blob/main/FH451/vul_62/README.md
Permissions Required
https://vuldb.com/?ctiid.349580
Third Party Advisory
https://vuldb.com/?id.349580
Third Party Advisory
https://vuldb.com/?submit.765330
Product
https://www.tenda.com.cn/
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