Quick answers
- Is CVE-2026-11557 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11557 being exploited in the wild.
- How severe is CVE-2026-11557?
- High severity, with a CVSS score of 8.8, published 8 June 2026.
- Which products and versions are affected?
- Tenda F451 1.0.0.7, 1.0.0.9.
- Is there a fix for CVE-2026-11557?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-11557 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-11557?
- Check whether you run Tenda F451 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow vulnerability exists in the 'fromNatlimit' function within the /goform/Natlimit component of Tenda F451 firmware versions 1.0.0.7 and 1.0.0.9. The root cause is the use of the unsafe 'sprintf' function to copy the user-controlled 'page' POST parameter into a fixed-size 256-byte stack buffer without length validation. A remote attacker with low privileges (access to the web interface) can exploit this by sending an overly long string in the 'page' parameter. Successful exploitation can lead to a Denial of Service (DoS) or Remote Code Execution (RCE). A public proof-of-concept exploit is available.
Affected products
- Tenda F451 Wireless Router 1.0.0.7, 1.0.0.9
Timeline
- 2026-06-08: disclosed: Vulnerability disclosed via VulDB and NVD
- 2026-06-08: advisory