Is CVE-2008-5021 in the CISA KEV catalog?

No. CVE-2008-5021 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2008-5021?

CVE-2008-5021 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2008-5021?

CVE-2008-5021 has an EPSS score of 3.63% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2008-5021?

Upgrade DeveloperEdition to 2.0.0.18 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2008-5021

HIGHEPSS 88th pctl

9.3

CVSS v2

NVD

Description

nsFrameManager in Firefox 3.x before 3.0.4, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by modifying properties of a file input element while it is still being initialized, then using the blur method to access uninitialized memory.

CWE-362Race Condition

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:2.0 2.0.0.18Fixed in:2.0.0.18Mozilla

Affected:3.0 3.0.4Fixed in:3.0.4Mozilla

Mozilla Firefox (en-US)Windows application

Affected:2.0 2.0.0.18Fixed in:2.0.0.18Mozilla

Affected:3.0 3.0.4Fixed in:3.0.4Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:2.0 2.0.0.18Fixed in:2.0.0.18Mozilla

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

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.63%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	KEV	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 2026-04-23.