What is CVE-2021-32581?

CVE-2021-32581 is a high-severity vulnerability in Acronis Cyber Protect Cloud, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2021-08-05.

How severe is CVE-2021-32581?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2021-32581 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Acronis Cyber Protect Cloud

CVE-2021-32581

Acronis True Image prior to 2021 Update 4 for Windows, Acronis True Image prior to 2021 Update 5 for Mac, Acronis Agent prior to build 26653, Acronis Cyber Protect prior to build 27009 did not implement SSL certificate validation.

Vulnerability class: Improper Certificate Validation

Published 2021-08-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.6th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

Public proof-of-concept exploits

aapooksman/certmitm

References

kb.acronis.com/content/68419 (Vendor Advisory)
kb.acronis.com/content/68413 (Vendor Advisory)
kb.acronis.com/content/68648 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-32581?: CVE-2021-32581 is a high-severity vulnerability in Acronis Cyber Protect Cloud, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2021-08-05.
How severe is CVE-2021-32581?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-32581 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.