Is CVE-2009-1837 in the CISA KEV catalog?

No. CVE-2009-1837 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-1837?

CVE-2009-1837 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2009-1837?

CVE-2009-1837 has an EPSS score of 4.33% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-1837?

Upgrade DeveloperEdition to 3.0.11 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2009-1837

HIGHEPSS 90th pctl

7.5

CVSS v3

NVD

Description

Race condition in the NPObjWrapper_NewResolve function in modules/plugin/base/src/nsJSNPRuntime.cpp in xul.dll in Mozilla Firefox 3 before 3.0.11 might allow remote attackers to execute arbitrary code via a page transition during Java applet loading, related to a use-after-free vulnerability for memory associated with a destroyed Java object.

CWE-362Race Condition CWE-416Use After Free

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:3.0 3.0.11Fixed in:3.0.11Mozilla

Mozilla Firefox (en-US)Windows application

Affected:3.0 3.0.11Fixed in:3.0.11Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.33%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory6

Third-Party Advisory6

Issue Tracking1

bugzilla.redhat.com

Mailing List2

Other references5

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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.