AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-3311

CRITICAL · CVSS 9.8 EPSS 2.90% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-02-05 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

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

GitHub PoC Links

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

CVE
CVE-2021-3311
Severity
CRITICAL
CVSS
9.8
EPSS
2.90%

Original NVD Description

An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.

Related CVEs

Other vulnerabilities affecting the same vendor(s)