CVE-2020-16171

mediumpriority · track · 38EPSS 0.055 · 93 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

5.50% (93rd) EPSS

CVSS 6.4 · medium

Is it mine?

3 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.06.4mediumAV:N/AC:L/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 4.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.5

v3.16.2mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-49113Acronis Cyber Backup 12.5 Build 16341 - Unauthenticated SSRFPoC · exploit_db

affected products (3)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
acronis cyber backup≤ 12.5nvdUScpe:2.3:a:acronis:cyber_backup:*:*:*:*:*:*:*:*
acronis cyber backup= 12.5nvdUScpe:2.3:a:acronis:cyber_backup:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2020-09-21modified 2026-06-17

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+4181 more

references (9)

External citations — patches, advisories, analysis.

scry

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