THREATPORT/VULNERABILITY/CVE-2020-16171
MEDIUM SEVERITY

CVE-2020-16171

Cyber Backup vulnerability

CVSS
6.5
EPSS
5.5%
EPSS pct
92th
Exploited
No known
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.
Affected vendor
Acronis
Affected product
Cyber Backup
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness type (CWE)
  • CWE-918 — Server-Side Request Forgery (SSRF)
Published
2020-09-21

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 5.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2020-16171

  • Confirm whether Acronis Cyber Backup is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-16171.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-16171

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-16171 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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