VulnRadar

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Page generated: 09 Nov 2026, 05:28 UTC

CVE-2021-28550

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Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. 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.

CVSS 9.6 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.7/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 9.6: +1.44
Fresh EPSS: 52.13%: +0.26

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 11 documents and public datasets.

Hype components

Headline sample (25%)

0/100

Press, 30 days (60%)

0/100

Grounded branding (15%)

0/100

HYPE TOTAL0/100

Sources and documents

Security Affairs

Press · 28 Jul 2022, 07:00 · European firm DSIRF behind the attacks with Subzero surveillance malware - Security Affairs

Microsoft

Press · 27 Jul 2022, 07:00 · Untangling KNOTWEED: European private-sector offensive actor using 0-day exploits - Microsoft

BleepingComputer

Press · 27 Jul 2022, 07:00 · Microsoft: Windows, Adobe zero-days used to deploy Subzero malware - BleepingComputer

Qualys

Press · 22 Feb 2022, 08:00 · Managing CISA Known Exploited Vulnerabilities with Qualys VMDR - Qualys

CrowdStrike

Press · 10 Jun 2021, 07:00 · June 2021 Patch Tuesday: Updates and Analysis - CrowdStrike

See all 11 source documents

The Hacker News

Press · 09 Jun 2021, 07:00 · Update Your Windows Computers to Patch 6 New In-the-Wild Zero-Day Bugs - The Hacker News

The Record from Recorded Future News

Press · 08 Jun 2021, 07:00 · Microsoft patches six Windows zero-days, including a commercial exploit - The Record from Recorded Future News

Cisco Talos Blog

Press · 08 Jun 2021, 07:00 · Microsoft Patch Tuesday for June 2021 — Snort rules and prominent vulnerabilities - Cisco Talos Blog

Computerworld

Press · 14 May 2021, 07:00 · Browser updates are back for the May’s Patch Tuesday - Computerworld

The Hacker News

Press · 12 May 2021, 07:00 · Alert: Hackers Exploit Adobe Reader 0-Day Vulnerability in the Wild - The Hacker News

BleepingComputer

Press · 11 May 2021, 07:00 · Adobe fixes Reader zero-day vulnerability exploited in the wild - BleepingComputer

Score evolution

● Hype ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.7 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence: Exploitation recorded
Priority basis: Recorded exploitation; CVSS 9.6; EPSS 52.1%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, no prior privileges, user interaction.
Observed activity: Exploitation recorded in CISA KEV.
Known scale: Not quantified.
Evidence confidence basis: Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:25.853394+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

First press mention

11 May 2021, 07:00

Published

02 Sep 2021, 16:07

Added to the CISA KEV catalog

03 Nov 2021, 00:00

Latest press mention

28 Jul 2022, 07:00

Score calculated

05 Nov 2026, 13:58