CVE-2021-36121

8.8 highEPSS 2.1%

High (8.8) in echobh sharecare. EPSS 2.1% chance of exploitation in the next 30 days.

An issue was discovered in Echo ShareCare 8.15.5. The file-upload feature in Access/DownloadFeed_Mnt/FileUpload_Upd.cfm is susceptible to an unrestricted upload vulnerability via the name1 parameter, when processing remote input from an authenticated user, leading to the ability for arbitrary files to be written to arbitrary filesystem locations via ../ Directory Traversal on the Z: drive (a hard-coded drive letter where ShareCare application files reside) and remote code execution as the ShareCare service user (NT AUTHORITY\SYSTEM).

Severity

CVSS 3.1

8.8 high

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

EPSS: 2.1% chance of exploitation in the next 30 days; higher than 82% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2021-07-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

echobh:sharecare

References

https://github.com/atredispartners/advisories/blob/master/ATREDIS-2021-0001.md
https://github.com/atredispartners/advisories/blob/master/ATREDIS-2021-0001.md

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