How severe is CVE-2004-0421?

CVE-2004-0421 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-0421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0421?

CVE-2004-0421 primarily affects Libpng. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-0421 published?

CVE-2004-0421 was published on 2004-08-18 and last updated on 2026-06-16.

CVE-2004-0421

CVE-2004-0421 is a medium-severity vulnerability in Libpng with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Libpng
Published: 2004-08-18
Last modified: 2026-06-16

Description

The Portable Network Graphics library (libpng) 1.0.15 and earlier allows attackers to cause a denial of service (crash) via a malformed PNG image file that triggers an error that causes an out-of-bounds read when creating the error message.

Frequently asked questions

What is CVE-2004-0421?: The Portable Network Graphics library (libpng) 1.0.15 and earlier allows attackers to cause a denial of service (crash) via a malformed PNG image file that triggers an error that causes an out-of-bounds read when creating the error message.
How severe is CVE-2004-0421?: CVE-2004-0421 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-0421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0421?: CVE-2004-0421 primarily affects Libpng. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0421 published?: CVE-2004-0421 was published on 2004-08-18 and last updated on 2026-06-16.

References

Affected products (26)

cpe:2.3:a:libpng:libpng:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.6:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.7:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.8:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.9:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.10:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.11:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.12:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.13:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.0.14:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:libpng:libpng:1.2.5:*:*:*:*:*:*:*
cpe:2.3:a:openpkg:openpkg:1.3:*:*:*:*:*:*:*
cpe:2.3:a:openpkg:openpkg:2.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:libpng:1.2.2-16:*:*:*:*:*:*:*
cpe:2.3:a:redhat:libpng:1.2.2-20:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:2.1:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:3.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:3.0:*:*:*:*:*:*:*
cpe:2.3:o:trustix:secure_linux:2.0:*:*:*:*:*:*:*
cpe:2.3:o:trustix:secure_linux:2.1:*:*:*:*:*:*:*

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CVE-2014-9495 — High (CVSS 8.8): Heap-based buffer overflow in the png_combine_row function in libpng before 1.5.21 and 1.6.x before 1.6.16, when…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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