CVE-2020-16171 json
An issue was discovered in Acronis Cyber Backup before 12.5 Build 16342.
published 2020-09-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8137
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.5%
- EPSS 5.5% chance of exploitation in 30 days, percentile 92%
- public exploits
- 1
- Exploit-DB
Summary
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.
Timeline
- Published
- First public exploit (EDB-49113)
Exploit prediction
5.50% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-49113 Acronis Cyber Backup 12.5 Build 16341 - Unauthenticated SSRF webapps, 2020-11-27
- seclists.org http://seclists.org/fulldisclosure/2020/Sep/33 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
seclists.org
/fulldisclosure/2020/Sep/33
exploit, mailing-list, third-party-advisory
-
rcesecurity.com
/2020/09/CVE-2020-16171-Exploiting-Acronis-Cyber-Backup-for-Fun-and-Emails/
third-party-advisory
Sources
- CVE List CVE-2020-16171
- NVD CVE-2020-16171
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.