CVE-2019-9900

HighCVSS 8.3/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Weakness enumeration

CWE-74

Affected software

No affected versions have been published.

Timeline

Published: Apr 25, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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