Is CVE-2009-2463 in the CISA KEV catalog?

No. CVE-2009-2463 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-2463?

CVE-2009-2463 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2009-2463?

CVE-2009-2463 has an EPSS score of 6.43% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-2463?

Upgrade nspr on debian 11 to 4.8.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2009-2463

HIGHEPSS 93th pctl

10.0

CVSS v2

NVD

Description

Multiple integer overflows in the (1) PL_Base64Decode and (2) PL_Base64Encode functions in nsprpub/lib/libc/src/base64.c in Mozilla Firefox before 3.0.12, Thunderbird before 2.0.0.24, and SeaMonkey before 1.1.19 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors that trigger buffer overflows.

CWE-189

How to fix

Remediation Available

nsprDebian

Fixed in:4.8.2-1CVE-2009-2463

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

6.43%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Related Vulnerabilities

Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1538	High	10.0	99%	-	-
CVE-2006-3747	High	7.6	96%	-	Fix
CVE-2007-0071	High	9.3	93%	-	-
CVE-2015-3829	High	10.0	90%	-	-
CVE-2015-3864	High	10.0	87%	-	-
CVE-2015-1539	High	10.0	86%	-	-

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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.