CVE-2021-27341

Critical

Published: 16 September 2021

Published

16 September 2021

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0135 80.5th percentile

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

Summary

CVE-2021-27341 is a critical-severity Path Traversal (CWE-22) vulnerability in Os4Ed Opensis. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 19.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

OpenSIS Community Edition version <= 7.6 is affected by a local file inclusion vulnerability in DownloadWindow.php via the "filename" parameter.

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

os4ed

opensis

≤ 7.6

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.

addresses: CWE-22

Validates pathnames and filenames to prevent traversal outside intended directories.