Is CVE-2009-3956 in the CISA KEV catalog?

No. CVE-2009-3956 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-3956?

CVE-2009-3956 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2009-3956?

CVE-2009-3956 has an EPSS score of 7.73% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2009-3956?

No published fix for CVE-2009-3956 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2009-3956

HIGHEPSS 94th pctl

10.0

CVSS v2

NVD

Description

The default configuration of Adobe Reader and Acrobat 9.x before 9.3, and 8.x before 8.2 on Windows and Mac OS X, does not enable the Enhanced Security feature, which has unspecified impact and attack vectors, related to a "script injection vulnerability," as demonstrated by Acrobat Forms Data Format (FDF) behavior that allows cross-site scripting (XSS) by user-assisted remote attackers.

CWE-16

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

7.73%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch1

adobe.com

Government Resource1

us-cert.gov

Other references12

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.