AUGUST 4, 2026
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Case File

CVE-2021-43099

MEDIUM · CVSS 4.9 EPSS 1.09% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2022-03-28 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit
GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-43099
Severity
MEDIUM
CVSS
4.9
EPSS
1.09%
Java

Original NVD 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).