CVE-2021-20177

CVSS V2 Low 2.1 CVSS V3 Medium 4.4

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.

Overview

CVE ID
CVE-2021-20177

Assigner
secalert@redhat.com

Vulnerability Status
Analyzed

Published Version
2021-05-26T21:15:08

Last Modified Date
2021-06-02T21:02:53

Weakness Enumerations

CWE	URL
CWE-125	http://cwe.mitre.org/data/definitions/125.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:o:linux:linux_kernel::::::::	1	OR		5.4.9

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:L/Au:N/C:N/I:N/A:P

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
NONE

Availability Impact
PARTIAL

Base Score
2.1

Severity
LOW

Exploitability Score
3.9

Impact Score
2.9

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
HIGH

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
HIGH

Base Score
4.4

Base Severity
MEDIUM

Exploitability Score
0.8

Impact Score
3.6

References

Reference URL	Reference Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1914719	Issue Tracking Patch Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-20177
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20177

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 16:13:47				Added to TrackCVE
2022-12-05 03:04:48	2021-05-26T21:15Z	2021-05-26T21:15:08	CVE Published Date	updated
2022-12-05 03:04:49		2021-06-02T21:02:53	CVE Modified Date	updated
2022-12-05 03:04:49		Analyzed	Vulnerability Status	updated