CVE-2020-16171 EXPLOIT
6.5
MEDIUM · CVSS 3.1 · EPSS 5.5% (pctl 93)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.5 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| EPSS | 5.51% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-918 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2020-09-21 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| acronis | cyber backup |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Acronis Cyber Backup 12.5 Build 16341 - Unauthenticated SSRF | 2020-11-27 |
References
→ the Explorer · watch your stack · NVD