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Case File

CVE-2019-9900

HIGH · CVSS 8.3 EPSS 3.73% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2019-04-25 · 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.

GitHub PoC Links
github.com ↗ github.com ↗

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

CVE
CVE-2019-9900
Severity
HIGH
CVSS
8.3
EPSS
3.73%

Original NVD Description

When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.