CVE-2020-16171

MEDIUM

Acronis Cyber Backup < 12.5 - SSRF

Title source: rule

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.

Exploits (1)

exploitdb WRITEUP

by Julien Ahrens · pythonwebappsmultiple

https://www.exploit-db.com/exploits/49113

View Code ZIP pw:eip

References (2)

[Exploit, Mailing List, Third Party Advisory] http://seclists.org/fulldisclosure/2020/Sep/33

[Third Party Advisory] https://www.rcesecurity.com/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/

Scores

CVSS v3 6.5

EPSS 0.1121

EPSS Percentile 93.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Details

CWE

CWE-918

Status published

Products (2)

acronis/cyber_backup 12.5 (15 CPE variants)

acronis/cyber_backup < 12.5

Published Sep 21, 2020

Tracked Since Feb 18, 2026