High severity · published Mar 29, 2026
CVE-2026-5021
Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.
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 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
F4
F453 · Tenda
1.0.0.3 · source: vendor
FF
F453 Firmware · Tenda
1.0.0.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5021
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5021
Exploit
https://github.com/Litengzheng/vul_db/blob/main/F453/vul_92/README.md
Third Party Advisory
https://vuldb.com/submit/778415
Third Party Advisory
https://vuldb.com/vuln/353906
Permissions Required
https://vuldb.com/vuln/353906/cti
Product
https://www.tenda.com.cn/
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