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Case File

CVE-2021-28683

HIGH · CVSS 7.5 EPSS 1.69% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-05-20 · 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 ↗ github.com ↗ github.com ↗

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

CVE
CVE-2021-28683
Severity
HIGH
CVSS
7.5
EPSS
1.69%

Original NVD Description

An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.