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True Image CVE-2021-32579

HIGH
Improper Authentication (CWE-287)
2021-08-05 cve@mitre.org
Authentication Bypass RCE Apple Microsoft True Image Acronis
7.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-287
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived

A local attacker with access to the system could bypass authentication mechanisms to gain unauthorized access.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

Acronis True Image prior to 2021 Update 4 for Windows and Acronis True Image prior to 2021 Update 5 for macOS allowed an unauthenticated attacker (who has a local code execution ability) to tamper. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. Acronis True Image prior to 2021 Update 4 for Windows and Acronis True Image prior to 2021 Update 5 for macOS allowed an unauthenticated attacker (who has a local code execution ability) to tamper with the micro-service API. Affected products include: Acronis True Image. Version information: prior to 2021.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

Acronis True Image prior to 2021 Update 4 for Windows and Acronis True Image prior to 2021 Update 5 for macOS allowed an unauthenticated attacker (who has a local code execution ability) to tamper with the micro-service API.

Threat Intelligence Overview

EPSS Score
0.2%
Top 85% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:a:acronis:true_image:2021:-:*:*:*:macos:*:*
cpe:2.3:a:acronis:true_image:2021:-:*:*:*:windows:*:*
cpe:2.3:a:acronis:true_image:2021:update_1:*:*:*:macos:*:*
cpe:2.3:a:acronis:true_image:2021:update_1:*:*:*:windows:*:*
cpe:2.3:a:acronis:true_image:2021:update_2:*:*:*:macos:*:*
cpe:2.3:a:acronis:true_image:2021:update_2:*:*:*:windows:*:*
cpe:2.3:a:acronis:true_image:2021:update_3:*:*:*:macos:*:*
cpe:2.3:a:acronis:true_image:2021:update_3:*:*:*:windows:*:*
cpe:2.3:a:acronis:true_image:2021:update_4:*:*:*:macos:*:*

More in True Image

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CVE-2017-3219 HIGH
8.8 Jun 21

Acronis True Image up to and including version 2017 Build 8053 performs software updates using HTTP. Rated high severity
CVE-2021-32581 HIGH
8.1 Aug 05

Acronis True Image prior to 2021 Update 4 for Windows, Acronis True Image prior to 2021 Update 5 for Mac, Acronis Agent

CVE-2021-32580 HIGH
7.8 Aug 05

Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to DLL hijacking. Rated hig
CVE-2021-32578 HIGH
7.8 Aug 05

Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to improper soft link handl
CVE-2021-32577 HIGH
7.8 Aug 05

Acronis True Image prior to 2021 Update 5 for Windows allowed local privilege escalation due to insecure folder permissi
CVE-2021-32576 HIGH
7.8 Aug 05

Acronis True Image prior to 2021 Update 4 for Windows allowed local privilege escalation due to improper soft link handl
CVE-2020-10139 HIGH
7.8 Oct 21

Acronis True Image 2021 includes an OpenSSL component that specifies an OPENSSLDIR variable as a subdirectory within C:\
CVE-2020-10140 HIGH
7.3 Oct 21

Acronis True Image 2021 fails to properly set ACLs of the C:\ProgramData\Acronis directory. Rated high severity (CVSS 7.

Same weakness CWE-287 – Improper Authentication

View all
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2020-0688 HIGH POC
8.8
CVE-2023-46805 HIGH POC
8.2
CVE-2023-35078 CRITICAL POC
9.8
CVE-2015-1187 CRITICAL POC
9.8
CVE-2024-7593 CRITICAL POC
9.8
CVE-2017-7921 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
ADVISORY https://kb.acronis.com/content/68413 ADVISORY https://kb.acronis.com/content/68419

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