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CVE-2020-16171

MEDIUM
6.5
CVSS Score
Published: September 21, 2020 at 01:07 PM UTC
Updated: June 17, 2026 at 02:57 AM UTC
1 product affected across 1 vendorCyber Backup

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Severity
MEDIUM6.5
Exploit prediction
EPSS 6%

Description

An issue was discovered in Acronis Cyber Backup before 12.5 Build 16342. Some API endpoints on port 9877 under /api/ams/ accept an additional custom Shard header. The value of this header is afterwards used in a separate web request issued by the application itself. This can be abused to conduct SSRF attacks against otherwise unreachable Acronis services that are bound to localhost such as the NotificationService on 127.0.0.1:30572.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCExploitMailing ListThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2020/Sep/33
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.rcesecurity.com/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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