CVE-2026-5021 Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow
A stack-based buffer overflow in the Tenda F453 router's httpd service allows remote attackers to execute arbitrary code via the PPTPUserSetting interface.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5021?
CVE-2026-5021 is a high-severity memory corruption vulnerability in Tenda F453, published on 29 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-5021?
It affects 1 product.
Products include Tenda F453 Firmware.
How do I fix CVE-2026-5021?
No fix has been published for CVE-2026-5021 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-5021 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5021 exists.
Other vulnerabilities in Tenda F453
- CVE-2026-4551 Tenda F453 Parameters SafeClientFilter fromSafeClientFilter memory corruption
- CVE-2026-4552 Tenda F453 Parameters VirtualSer fromVirtualSer memory corruption
- CVE-2026-4553 Tenda F453 Parameters Natlimit fromNatlimit stack-based overflow
- CVE-2026-3726 Tenda F453 webExcptypemanFilter fromwebExcptypemanFilter stack-based overflow
- CVE-2026-3727 Tenda F453 QuickIndex sub_3C6C0 stack-based overflow
Sources
Also known as GHSA-pcxg-4cp2-qqj4.