CVE-2023-20027 — Use After Free in Cisco IOS XE Software

CWE-416 — Use After Free4 documents4 sources

Severity

8.6HIGHNVD

EPSS

1.1%

top 21.91%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Cisco IOS XE Software Cisco IOS XE

Timeline

PublishedMar 23

Description

A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploi…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HExploitability: 3.9 | Impact: 4.0

Affected Packages2 packages

▶CVEListV5cisco/cisco_ios_xe_softwaren/a

▶NVDcisco/ios_xe190 versions+189

🔴Vulnerability Details

GHSA

GHSA-w837-qm63-r5ph: A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticat↗2023-03-23

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CVEList

Cisco IOS XE Software Virtual Fragmentation Reassembly Denial of Service Vulnerability↗2023-03-23

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📋Vendor Advisories

Cisco

Cisco IOS XE Software Virtual Fragmentation Reassembly Denial of Service Vulnerability↗2023-03-22

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