CVE-2025-6138
Published: 16 June 2025
Summary
CVE-2025-6138 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Totolink T10 Firmware. Its CVSS base score is 7.4 (High).
Operationally, ranked in the top 19.4% 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 buffer overflow vulnerability, tracked as CVE-2025-6138, affects the TOTOLINK T10 wireless router running firmware version 4.1.8cu.5207. The flaw resides in the setWizardCfg function within the /cgi-bin/cstecgi.cgi component that handles HTTP POST requests. Unauthenticated manipulation of the ssid5g parameter can trigger a memory corruption condition classified under CWE-119 and CWE-120.
An attacker with network access can send a crafted HTTP POST request to the device and achieve remote code execution or cause a denial of service. The CVSS 4.0 score of 7.4 reflects the combination of low attack complexity, no required user interaction, and high impact on confidentiality, integrity, and availability. Public exploit code has already been disclosed, enabling straightforward reproduction by threat actors.
The associated EPSS score remains low and essentially flat at approximately 0.0136–0.0137, indicating limited observed exploitation interest since disclosure. No vendor advisory or patch information is provided in the available references.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-18434
Vulnerability details
A vulnerability classified as critical was found in TOTOLINK T10 4.1.8cu.5207. Affected by this vulnerability is the function setWizardCfg of the file /cgi-bin/cstecgi.cgi of the component HTTP POST Request Handler. The manipulation of the argument ssid5g leads to buffer overflow.…
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The attack can be launched 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.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
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.