CVE-2025-4139
Published: 30 April 2025
Summary
CVE-2025-4139 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Netgear Ex6120 Firmware. Its CVSS base score is 8.7 (High).
Operationally, ranked in the top 23.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A critical buffer overflow vulnerability exists in the fwAcosCgiInbound function of Netgear EX6120 firmware version 1.0.0.68. The issue stems from improper handling of the host argument, which can be manipulated to trigger memory corruption. The flaw is tracked under CWE-119 and CWE-120 and carries a CVSS 4.0 score of 8.7, reflecting network attack vector, low complexity, and low required privileges.
Remote attackers with low-level access can send specially crafted requests to the affected CGI endpoint, potentially achieving full control over confidentiality, integrity, and availability of the device without user interaction. The vendor was notified prior to disclosure but provided no response, leaving the device unpatched at the time of publication.
Public references include a detailed technical write-up on GitHub along with entries in VulDB that document the flaw, while the vendor's site offers no mitigation guidance or firmware update. The associated EPSS score remains low, with a current value of 0.0094 and a peak of 0.0105, indicating no significant surge in observed exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-12772
Vulnerability details
A vulnerability classified as critical was found in Netgear EX6120 1.0.0.68. Affected by this vulnerability is the function fwAcosCgiInbound. The manipulation of the argument host leads to buffer overflow. The attack can be launched remotely. The vendor was contacted early…
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about this disclosure but did not respond in any way.
- 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.