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CVE-2024-45491

Libexpat integer overflow

9.8 CRITICALEPSS 1.13%
  1. Published30 Aug 2024

Description

An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Libexpat< 2.6.3

Remediation

Fixed in
Libexpat≥ 2.6.3

References

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Frequently asked

Is CVE-2024-45491 being actively exploited?

CVE-2024-45491 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.13%.

How severe is CVE-2024-45491?

CVE-2024-45491 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.13% probability of exploitation.

Which products are affected by CVE-2024-45491?

Affected products include Libexpat.

How do I fix CVE-2024-45491?

Upgrade affected software to a fixed version, for example Libexpat 2.6.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-45491 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.