Is CVE-2013-4399 in the CISA KEV catalog?

No. CVE-2013-4399 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-4399?

CVE-2013-4399 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2013-4399?

CVE-2013-4399 has an EPSS score of 2.08% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-4399?

Upgrade libvirt on debian 11 to 1.1.4-1 or later.

CVE & CISA-KEV Catalog

CVE-2013-4399

MEDIUMEPSS 79th pctl

4.3

CVSS v2

NVD

Description

The remoteClientFreeFunc function in daemon/remote.c in libvirt before 1.1.3, when ACLs are used, does not set an identity, which causes event handler removal to be denied and remote attackers to cause a denial of service (use-after-free and crash) by registering an event handler and then closing the connection.

How to fix

Remediation Available

libvirtDebian

Fixed in:1.1.4-1CVE-2013-4399

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

2.08%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Patch1

security.libvirt.org

Other references4

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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 2026-05-06.