CVE-2021-39863

Acrobat Dc vulnerability

CVSS

7.8

EPSS

13.2%

EPSS pct

96th

Exploited

No known

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Buffer Overflow vulnerability when parsing a specially crafted PDF file. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Affected vendor

Adobe

Affected product

Acrobat Dc

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness type (CWE)

CWE-122 — Heap-based Buffer Overflow

Published

2021-09-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 13.2% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-39863

Confirm whether Adobe Acrobat Dc is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-39863.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-39863

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