AUGUST 4, 2026
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Case File

CVE-2021-27335

CRITICAL · CVSS 9.8 EPSS 3.00% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-02-18 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. It affects Java. Public exploit code or proof-of-concept references have been detected in its references. It may be remotely exploitable.

Public Exploit Signal

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

Detected Signals
remote code execution code execution

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

CVE
CVE-2021-27335
Severity
CRITICAL
CVSS
9.8
EPSS
3.00%
Java

Original NVD Description

KollectApps before 4.8.16c is affected by insecure Java deserialization, leading to Remote Code Execution via a ysoserial.payloads.CommonsCollections parameter.