CVE-2024-20266

Published Mar 13, 2024 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.

This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.

Notes:

Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.
This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco IOS XR Software

affected

Version	Status	Constraints
`5.2.0`	affected	—
`5.2.1`	affected	—
`5.2.2`	affected	—
`5.2.4`	affected	—
`5.2.3`	affected	—
`5.2.5`	affected	—
`5.2.47`	affected	—
`5.3.0`	affected	—
`5.3.1`	affected	—
`5.3.2`	affected	—
`5.3.3`	affected	—
`5.3.4`	affected	—
`6.0.0`	affected	—
`6.0.1`	affected	—
`6.0.2`	affected	—
`6.1.1`	affected	—
`6.1.2`	affected	—
`6.1.3`	affected	—
`6.1.4`	affected	—
`6.1.12`	affected	—
`6.1.22`	affected	—
`6.1.32`	affected	—
`6.1.36`	affected	—
`6.1.42`	affected	—
`6.2.1`	affected	—
`6.2.2`	affected	—
`6.2.3`	affected	—
`6.2.25`	affected	—
`6.2.11`	affected	—
`6.3.2`	affected	—
`6.3.3`	affected	—
`6.3.15`	affected	—
`6.4.1`	affected	—
`6.4.2`	affected	—
`6.4.3`	affected	—
`6.5.1`	affected	—
`6.5.2`	affected	—
`6.5.3`	affected	—
`6.5.25`	affected	—
`6.5.26`	affected	—
`6.5.28`	affected	—
`6.5.29`	affected	—
`6.5.32`	affected	—
`6.5.33`	affected	—
`6.6.2`	affected	—
`6.6.3`	affected	—
`6.6.25`	affected	—
`6.6.4`	affected	—
`7.0.1`	affected	—
`7.0.2`	affected	—
`7.0.12`	affected	—
`7.0.14`	affected	—
`7.1.1`	affected	—
`7.1.15`	affected	—
`7.1.2`	affected	—
`7.1.3`	affected	—
`6.7.1`	affected	—
`6.7.2`	affected	—
`6.7.3`	affected	—
`6.7.4`	affected	—
`7.2.0`	affected	—
`7.2.1`	affected	—
`7.2.2`	affected	—
`7.3.1`	affected	—
`7.3.15`	affected	—
`7.3.2`	affected	—
`7.3.3`	affected	—
`7.3.5`	affected	—
`7.4.1`	affected	—
`7.4.2`	affected	—
`6.8.1`	affected	—
`6.8.2`	affected	—
`7.5.1`	affected	—
`7.5.3`	affected	—
`7.5.2`	affected	—
`7.5.4`	affected	—
`7.5.5`	affected	—
`7.6.1`	affected	—
`7.6.2`	affected	—
`7.7.1`	affected	—
`7.7.2`	affected	—
`7.7.21`	affected	—
`6.9.1`	affected	—
`6.9.2`	affected	—
`7.8.1`	affected	—
`7.8.2`	affected	—
`7.9.1`	affected	—
`7.9.2`	affected	—
`7.9.21`	affected	—
`7.10.1`	affected	—
`7.10.2`	affected	—

No data.

Vendor	Product	Versions
Cisco	Ios Xr Software	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2024-17981	A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device. Notes: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload. This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.