CVE-2025-6887
Published: 30 June 2025
Summary
CVE-2025-6887 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, 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 vulnerability classified as critical exists in Tenda AC5 firmware version 15.03.06.47. It affects an unknown function in the file /goform/SetSysTimeCfg, where manipulation of the time or timeZone arguments triggers a stack-based buffer overflow. The issue is tracked under CWE-119 and CWE-121 and carries a CVSS 4.0 score of 7.4 with a network attack vector, low attack complexity, and low privileges required.
An attacker with network access and valid low-privileged credentials can send a crafted request to the affected endpoint, resulting in memory corruption that may allow arbitrary code execution or denial of service on the device. The exploit has already been made public and is rated as proof-of-concept available.
No vendor advisory or patch information is referenced in the available sources. The EPSS score remains flat at 0.0157 with no observed increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-19511
Vulnerability details
A vulnerability was found in Tenda AC5 15.03.06.47 and classified as critical. Affected by this issue is some unknown functionality of the file /goform/SetSysTimeCfg. The manipulation of the argument time/timeZone leads to stack-based buffer overflow. The attack may be launched…
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.
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.