CVE-2021-45339

CVSS V2 High 7.2 CVSS V3 High 7.8

Description

Privilege escalation vulnerability in Avast Antivirus prior to 20.4 allows a local user to gain elevated privileges by "hollowing" trusted process which could lead to the bypassing of Avast self-defense.

Overview

CVE ID
CVE-2021-45339

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-12-27T14:15:08

Last Modified Date
2022-07-12T17:42:04

Weakness Enumerations

CWE	URL
CWE-863	http://cwe.mitre.org/data/definitions/863.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:a:avast:antivirus::::::::	1	OR		20.4

CVSS Version 2

Version
2.0

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

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
7.2

Severity
HIGH

Exploitability Score
3.9

Impact Score
10

CVSS Version 3

Version
3.1

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

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
7.8

Base Severity
HIGH

Exploitability Score
1.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0	Exploit Third Party Advisory
https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0	Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-45339
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45339

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 06:37:53				Added to TrackCVE
2022-12-06 05:13:32	2021-12-27T14:15Z	2021-12-27T14:15:08	CVE Published Date	updated
2022-12-06 05:13:32		2022-07-12T17:42:04	CVE Modified Date	updated
2022-12-06 05:13:32		Analyzed	Vulnerability Status	updated