Buffer overflow in Opensatkit
CVE-2025-70085
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Opensatkit — versions 2.2.1
Weakness classification (CWE)
References
- github.com/OpenSatKit/OpenSatKit (Product)
- github.com/OpenSatKit/OpenSatKit/releases/tag/v2.2.1 (Release Notes)
- raw.githubusercontent.com/OpenSatKit/OpenSatKit/master/cfs/apps/filemgr/fsw/src… (Third Party Advisory)
- gist.github.com/jonafk555 (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-70085?
- CVE-2025-70085 is a critical-severity vulnerability in Opensatkit, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-02-11.
- How severe is CVE-2025-70085?
- Critical severity. CVSS v3 base score is 9.8 out of 10.