Is CVE-2003-1564 in the CISA KEV catalog?

No. CVE-2003-1564 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2003-1564?

CVE-2003-1564 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2003-1564?

CVE-2003-1564 has an EPSS score of 1.62% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2003-1564?

Upgrade libxml2 to 2.5.0 or later.

CVE & CISA-KEV Catalog

CVE-2003-1564

MEDIUMEPSS 73th pctl

6.5

CVSS v3

NVD

Description

libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack."

CWE-776

How to fix

Remediation Available

libxml2NVD

Affected:< 2.5.0Fixed in:2.5.0CVE-2003-1564derived from NVD

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 ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.62%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Patch1

mail.gnome.org

Issue Tracking1

reddit.com

Release Notes1

xmlsoft.org

Other references3

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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 2026-04-16.