What is the CVSS score of CVE-2021-44199?

CVE-2021-44199 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

Is there a patch available for CVE-2021-44199?

Yes, a patch is available for CVE-2021-44199. Update the affected software to the latest version immediately.

Cyber Protect CVE-2021-44199

MEDIUM

Uncontrolled Search Path Element (CWE-427)

2021-11-29 security@acronis.com

Denial Of Service Microsoft Agent Cyber Protect Cyber Protect Home Office Acronis

5.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-427 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V13 - Configuration Search path element control
Impact	CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived	Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAI

DLL hijacking could lead to denial of service. Rated medium severity (CVSS 5.5), this vulnerability is no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-427. DLL hijacking could lead to denial of service. The following products are affected: Acronis Cyber Protect 15 (Windows) before build 28035, Acronis Agent (Windows) before build 27305, Acronis Cyber Protect Home Office (Windows) before build 39612 Affected products include: Acronis Agent, Acronis Cyber Protect, Acronis Cyber Protect Home Office.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.5 MEDIUM

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

DLL hijacking could lead to denial of service. The following products are affected: Acronis Cyber Protect 15 (Windows) before build 28035, Acronis Agent (Windows) before build 27305, Acronis Cyber Protect Home Office (Windows) before build 39612

Threat Intelligence Overview

EPSS Score

0.2%

Top 87% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:acronis:agent:-:*:*:*:*:*:*:*

cpe:2.3:a:acronis:cyber_protect:*:*:*:*:*:*:*:*

cpe:2.3:a:acronis:cyber_protect:15:-:*:*:*:*:*:*

cpe:2.3:a:acronis:cyber_protect:15:update1:*:*:*:*:*:*

cpe:2.3:a:acronis:cyber_protect:15:update2:*:*:*:*:*:*

cpe:2.3:a:acronis:cyber_protect_home_office:-:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://security-advisory.acronis.com/advisories/SEC-2508

Search Externally

GitHub PoC

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