CVE-2021-44204 | Local privilege escalation via named pipe due to improper access control checks

Local privilege escalation via named pipe due to improper access control checks. The following products are affected: Acronis Cyber Protect 15 (Windows) before build 28035, Acronis Agent (Windows) before build 27147, Acronis Cyber Protect Home Office (Windows) before build 39612, Acronis True Image 2021 (Windows) before build 39287

Published: 2022-02-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-44204 is rated Low Risk (32.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-44204

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2023-03-07 0.89% 0.04% -0.84%
2 2022-02-08 — 0.89% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-44204

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2021-44204

Affected software / configurations for CVE-2021-44204

Vendor Product Version Raw CPE
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:*:*:*:*:-:*:*
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:update_1:*:*:*:windows:*:*
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:update_2:*:*:*:windows:*:*
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:update_3:*:*:*:windows:*:*
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:update_4:*:*:*:windows:*:*
acronis true_image 2021 cpe:2.3:a:acronis:true_image:2021:update_5:*:*:*:windows:*:*
acronis agent < c21.06 cpe:2.3:a:acronis:agent:*:*:*:*:*:*:*:*
acronis cyber_protect 15 cpe:2.3:a:acronis:cyber_protect:15:-:*:*:*:*:*:*
acronis cyber_protect 15 cpe:2.3:a:acronis:cyber_protect:15:update1:*:*:*:*:*:*
acronis cyber_protect 15 cpe:2.3:a:acronis:cyber_protect:15:update2:*:*:*:*:*:*
acronis cyber_protect_home_office — cpe:2.3:a:acronis:cyber_protect_home_office:-:*:*:*:*:*:*:*

References for CVE-2021-44204

cvelogic Threat Intelligence