Note: This vulnerability (CVE-2009-3459) was originally published in 2009, however CISA added it to the Known Exploited Vulnerabilities (KEV) catalog on 2026-05-20 due to detected active exploitation.
EPSS Alert: The probability of this vulnerability being exploited in the next 30 days is 87.0% (percentile: 99%).
Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2009-3459 |
| Alert Source | CISA KEV - Active Exploitation |
| CVE Publication Year | 2009 |
| Date Published | 2026-05-20 |
| Vendor | Adobe |
| Product | Acrobat and Reader |
| CVSS Score | 9.3 (critical) |
| EPSS Score | 87.0% (percentile: 99%) |
| CISA KEV | Yes - confirmed active exploitation |
| Ransomware | Not confirmed |
| Remediation Deadline | 2026-06-03 |
Vulnerability Description
Adobe Acrobat and Reader contain a heap-based buffer overflow vulnerability which could allow remote attackers to execute arbitrary code via a crafted PDF file that triggers memory corruption.
Required Actions
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
High Exploitation Risk
According to EPSS (Exploit Prediction Scoring System), the probability of this vulnerability being exploited within 30 days is very high (87.0%). We recommend prioritizing this update.
Who Is Affected?
This vulnerability affects Acrobat and Reader by Adobe. Check if your organization uses this software and requires updates.
Sources
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