What is the CVSS score of CVE-2026-28718?

CVE-2026-28718 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-28718?

Within 24 hours: Inventory all Acronis Cyber Protect 17 installations and identify systems running builds prior to 41186. Within 7 days: Implement network segmentation to restrict authentication traffic to trusted sources only and enable detailed logging of authentication attempts for anomaly detection. Within 30 days: Upgrade to build 41186 or later once the patch becomes available, or transition to an alternative backup solution if upgrade timeline is uncertain.

Cyber Protect CVE-2026-28718

HIGH

Logging of Excessive Data (CWE-779)

2026-03-06 security@acronis.com

Windows Denial Of Service Linux Cyber Protect Acronis

7.5

CVSS 3.1 · NVD

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send malformed authentication request
Exploit

Bypass input validation in logging
Execution

Trigger resource exhaustion
Impact

Service becomes unavailable

Vulnerability Assessment

Weakness	CWE CWE-779 OWASP Top 10:2025 A09:2025 - Security Logging & Alerting Failures ASVS 5.0 V16 - Security Logging and Error Handling Logging volume control
Exploitation Conditions	Acronis Cyber Protect 17 (Linux or Windows) before build 41186 with authentication logging enabled. Remote unauthenticated attacker can trigger DoS via crafted authentication packets against default installations.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Acronis Cyber Protect 17 on Linux and Windows versions prior to build 41186 is vulnerable to denial of service through improper input validation in authentication logging functions. An unauthenticated remote attacker can crash the application or render it unavailable without requiring user interaction. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 7.5

Denial of service due to insufficient input validation in authentication logging. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 41186. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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

Affects Cyber Protect. Denial of service due to insufficient input validation in authentication logging. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 41186.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

Denial of service due to insufficient input validation in authentication logging. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 41186.

Executive ViewAI

Why It Matters

Acronis Cyber Protect 17 contains a denial of service vulnerability affecting both Linux and Windows deployments that could be exploited to disrupt backup and recovery operations. Organizations running unpatched versions risk service interruptions that could impact business continuity and data protection capabilities.

Business Impact: High

Compensating Controls

Implement network-level rate limiting on authentication endpoints; restrict administrative access to Acronis management interfaces via firewall rules and VPN; disable remote authentication logging features if not operationally critical; monitor authentication logs for excessive failed attempts and implement automated alerts; consider load balancing across multiple Acronis instances to distribute potential DoS impact.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% exploitable

Data Quality

3 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 0.1%

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

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

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)CVE.org

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

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References

Advisories & patches

ADVISORY https://security-advisory.acronis.com/advisories/SEC-8377

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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