VULNERABILITY INTELLIGENCE

CVE-2021-20177

CVSS score4.4 MEDIUM
EPSS probability0.28%
CISA KEVNot currently listed
Published2021-05-26
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Description

A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the system. Kernel before kernel 5.5-rc1 is affected.

Weakness classification

  • secalert@redhat.com: CWE-125

Primary references