CVE-2020-16171

Public Exploit

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 9.95% Top 10%
Third-Party Advisory seclists.org Third-Party Advisory rcesecurity.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://seclists.org/fulldisclosure/2020/Sep/33 mailing list exploit third party advisory
https://www.rcesecurity.com/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-16171?
CVE-2020-16171 has been scored as a medium severity vulnerability.
How to fix CVE-2020-16171?
To fix CVE-2020-16171, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-16171 being actively exploited in the wild?
It is possible that CVE-2020-16171 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~10% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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