Is CVE-2009-1537 in the CISA KEV catalog?

Yes. CVE-2009-1537 is on the CISA Known Exploited Vulnerabilities list, added 2026-05-20.

What is the CVSS severity of CVE-2009-1537?

CVE-2009-1537 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2009-1537?

CVE-2009-1537 has an EPSS score of 51.21% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2009-1537?

No published fix for CVE-2009-1537 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-06-03. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2009-1537

HIGHCISA KEVEPSS 99th pctl

8.8

CVSS v3

NVD

Description

Unspecified vulnerability in the QuickTime Movie Parser Filter in quartz.dll in DirectShow in Microsoft DirectX 7.0 through 9.0c on Windows 2000 SP4, Windows XP SP2 and SP3, and Windows Server 2003 SP2 allows remote attackers to execute arbitrary code via a crafted QuickTime media file, as exploited in the wild in May 2009, aka "DirectX NULL Byte Overwrite Vulnerability."

CWE-158

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-06-03

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

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

51.21%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-06-03

References

Patch1

microsoft.com

Vendor Advisory6

Government Resource2

Other references5

Related Vulnerabilities

Other CWE-158 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-47812	Critical	10.0	95%	KEV	Fix
CVE-2022-20812	Critical	9.0	1.8%	-	Fix
CVE-2020-14500	Critical	10.0	1.7%	-	-
CVE-2020-7928	Medium	6.5	1.4%	-	Fix
CVE-2022-20813	Critical	9.0	1.0%	-	Fix
CVE-2025-9648	High	-	0.7%	-	Fix

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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 2026-05-21.