What is CVE-2021-28545?

CVE-2021-28545 is a high-severity vulnerability in Adobe Acrobat, classified under CWE-353. CVSS score: 8.1/10. Published 2021-04-01.

How severe is CVE-2021-28545?

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

Vulnerability in Adobe Acrobat

CVE-2021-28545

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are missing support for an integrity check. An unauthenticated attacker would have the ability to completely manipulate data in a certified PDF without invalidating the original certification. Exploitation of this issue requires user interaction in that a victim must open the tampered file.

Published 2021-04-01 · 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: 0.023 (82.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Adobe Acrobat
Adobe Acrobat Dc
Adobe Acrobat Reader — versions unspecified
Adobe Acrobat Reader
Adobe Acrobat Reader Dc
Apple macOS
Microsoft Windows

Weakness classification (CWE)

CWE-353

References

helpx.adobe.com/security/products/acrobat/apsb21-09.html (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-28545?: CVE-2021-28545 is a high-severity vulnerability in Adobe Acrobat, classified under CWE-353. CVSS score: 8.1/10. Published 2021-04-01.
How severe is CVE-2021-28545?: High severity. CVSS v3 base score is 8.1 out of 10.