CVE-2025-3259
Published: 04 April 2025
Summary
CVE-2025-3259 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Rx3 Firmware. Its CVSS base score is 8.7 (High).
Operationally, ranked in the top 24.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A critical stack-based buffer overflow vulnerability, tracked as CVE-2025-3259 and also associated with CWE-119, CWE-121, and CWE-787, affects the Tenda RX3 wireless router running firmware 16.03.13.11. The flaw resides in the formSetDeviceName function within the /goform/SetOnlineDevName endpoint, where unsanitized input to the devName argument can overwrite the stack.
An authenticated remote attacker with low privileges can supply a crafted device name over the network to trigger the overflow. Successful exploitation yields high impact on confidentiality, integrity, and availability, potentially allowing arbitrary code execution or denial of service on the device.
Public exploit code has been disclosed, and the references point to detailed technical write-ups on VulDB and a third-party Notion page along with the vendor site, though no specific patch or mitigation guidance is provided in the available references. The EPSS score rose from a low baseline to a peak of 0.0211 on 2026-02-03 before receding to the current 0.0085, indicating a temporary increase in exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-9765
Vulnerability details
A vulnerability, which was classified as critical, has been found in Tenda RX3 16.03.13.11. This issue affects the function formSetDeviceName of the file /goform/SetOnlineDevName. The manipulation of the argument devName leads to stack-based buffer overflow. The attack may be initiated…
more
remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.