CVE-2025-70085

Critical

Published: 11 February 2026

Published

11 February 2026

Modified

17 February 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0006 20.2th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-70085 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Opensatkit Opensatkit. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly mandates identification, reporting, and correction of the stack buffer overflow flaw in OpenSatKit's file.c by patching unsafe sprintf calls with bounded alternatives.

SI-10 Information Input Validation good match

prevent

Requires validation of filename inputs to ensure combined lengths with constant text do not exceed the 256-byte EventErrStr buffer, preventing the overflow.

SI-16 Memory Protection good match

prevent

Implements memory protections such as stack canaries, ASLR, and DEP to prevent unauthorized code execution even if the buffer overflow occurs.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Remote network-accessible stack buffer overflow in file manager component directly enables exploitation of a public-facing application for arbitrary code execution (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

An issue was discovered in OpenSatKit 2.2.1. The EventErrStr buffer has a fixed size of 256 bytes. The code uses sprintf to format two filenames (Source1Filename and the string returned by FileUtil_FileStateStr) into this buffer without any length checking and…

without using bounded format specifiers such as %.*s. If the filename length approaches OS_MAX_PATH_LEN (commonly 64-256 bytes), the combined formatted string together with constant text can exceed 256 bytes, resulting in a stack buffer overflow. Such unsafe sprintf calls are scattered across multiple functions in file.c, including FILE_ConcatenateCmd() and ConcatenateFiles(), all of which fail to validate the output length.

Deeper analysisAI

CVE-2025-70085, published on 2026-02-11, is a stack buffer overflow vulnerability (CWE-121) in OpenSatKit version 2.2.1. The flaw resides in the file manager component at cfs/apps/filemgr/fsw/src/file.c, where the EventErrStr buffer is fixed at 256 bytes. Code in multiple functions, including FILE_ConcatenateCmd() and ConcatenateFiles(), uses sprintf to format two filenames—Source1Filename and the string from FileUtil_FileStateStr—without length validation or bounded specifiers like %.*s. Filenames approaching OS_MAX_PATH_LEN (typically 64-256 bytes), combined with constant text, exceed the buffer size, triggering the overflow.

The vulnerability carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating network-accessible exploitation with low attack complexity, no privileges, no user interaction, and unchanged scope. Remote attackers can trigger the buffer overflow, potentially achieving high-impact compromise of confidentiality, integrity, and availability, such as arbitrary code execution on affected systems running the vulnerable OpenSatKit instance.

References provided include a GitHub Gist (https://gist.github.com/jonafk555) likely detailing the discovery, the OpenSatKit repository (https://github.com/OpenSatKit/OpenSatKit), the v2.2.1 release page (https://github.com/OpenSatKit/OpenSatKit/releases/tag/v2.2.1), and the vulnerable source file (https://raw.githubusercontent.com/OpenSatKit/OpenSatKit/master/cfs/apps/filemgr/fsw/src/file.c). No explicit patch or mitigation guidance is detailed in the CVE description.