Vulnerability Monitor

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CVE-2020-16171

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 1 product from acronis organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-09-21T14:15:13.370

Last Modified

2024-11-21T05:06:54.360

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

4.9

Weaknesses

Type: Primary
CWE-918

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	acronis	cyber_backup	≤ 12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes
Application	acronis	cyber_backup	12.5	Yes

References

http://seclists.org/fulldisclosure/2020/Sep/33 Exploit, Mailing List, Third Party Advisory ([email protected])
https://www.rcesecurity.com/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/ Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2020/Sep/33 Exploit, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.rcesecurity.com/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For acronis's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.