CVE-2025-6886
Published: 30 June 2025
Summary
CVE-2025-6886 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Tenda Ac5 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 18.1% 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 stack-based buffer overflow vulnerability exists in Tenda AC5 firmware version 15.03.06.47 and is tracked as CVE-2025-6886. It affects an unspecified function in the /goform/openSchedWifi endpoint, where unsanitized input supplied to the schedStartTime or schedEndTime parameters can corrupt the stack. The flaw is assigned CWE-119 and CWE-121 and rated 7.4 under CVSS 4.0.
An authenticated remote attacker can send a crafted HTTP request to trigger the overflow, resulting in arbitrary code execution or a crash of the wireless router. The attack requires no user interaction and can be launched over the network; a working exploit has already been published.
The listed references consist of technical write-ups on Notion and Vuldb that reproduce the issue but contain no vendor advisory, firmware update, or mitigation guidance. The EPSS score has remained flat at 0.0157 since disclosure, indicating no measurable increase in observed exploitation activity.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-28774
Vulnerability details
A vulnerability has been found in Tenda AC5 15.03.06.47 and classified as critical. Affected by this vulnerability is an unknown functionality of the file /goform/openSchedWifi. The manipulation of the argument schedStartTime/schedEndTime leads to stack-based buffer overflow. The attack can be…
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launched remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the Tenda AC5 router's web interface (/goform/openSchedWifi) via remote manipulation of schedStartTime/schedEndTime parameters enables remote code execution, facilitating exploitation of a public-facing application.
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.
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.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.