Cyber Resilience

CVE-2021-28634

High

Published: 20 August 2021

Published
20 August 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 8.2 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS Score 0.0358 88.0th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-28634 is a high-severity OS Command Injection (CWE-78) vulnerability in Adobe Acrobat Dc. Its CVSS base score is 8.2 (High).

Operationally, ranked in the top 12.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Acrobat Reader DC versions 2021.005.20054 (and earlier), 2020.004.30005 (and earlier) and 2017.011.30197 (and earlier) are affected by an Improper Neutralization of Special Elements used in an OS Command. An authenticated attacker could leverage this vulnerability to achieve arbitrary code execution…

more

on the host machine in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CWE(s)
CWE-78

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

adobe
acrobat dc
15.008.20082 — 21.005.20054 · 17.011.30059 — 17.011.30197 · 20.001.30005 — 20.004.30005
adobe
acrobat reader dc
15.008.20082 — 21.005.20054 · 17.011.30059 — 17.011.30197 · 20.001.30005 — 20.004.30005

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References