CVE-2021-43099

PoC —

CVSS 3.1

4.9 medium

EPSS

1%p64

Published

Mar 28, 2022 (Mar 28, 2022)

Modified

Jun 17, 2026

Description

An Archive Extraction (AKA "Zip Slip) vulnerability exists in bbs 5.3 in the UpgradeNow function in UpgradeManageAction.java, which unzips the arbitrary upladed zip file without checking filenames. The vulnerability is exploited using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe).

Vendors: diyhi
Products: bbs
Weakness: CWE-22
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (1.1%)

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