CVE-2021-44203Network attack vector

Stored script execution via protection-plan details

Published Nov 29, 2021 · Updated Sep 16, 2024

Stored XSS in Acronis Cyber Protect 15 before build 28035 allows remote authenticated users to execute script through protection-plan details. Acronis has not disclosed the specific field or code path that fails to neutralize the saved input before the web console renders it. A different user must view the saved details, which runs the attacker-supplied script in that user's web-console context.

CVSS severity5.4
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Acronis Cyber Protect 15 before build 28035 allows remote authenticated users to execute script through protection-plan details. Acronis has not disclosed the specific field or code path that fails to neutralize the saved input before the web console renders it. A different user must view the saved details, which runs the attacker-supplied script in that user's web-console context.

The record

CVE
CVE-2021-44203
Published
Nov 29, 2021
Updated
Sep 16, 2024
Vendor
Acronis
Product
Acronis Cyber Protect 15
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <28035

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Acronis · Acronis Cyber Protect 15version=unspecified <28035

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo