NVD

CVE-2024-20266 Detail

Not Scheduled

This CVE record is not being prioritized for NVD enrichment efforts due to resource or other concerns.

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Cisco Systems, Inc.

Base Score: 5.3 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm	CVE, Cisco Systems, Inc.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	Cisco Systems, Inc.

Change History

5 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 3:06:09 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 7879 characters.
View Entire Change Record

[{"vendor":"cisco","product":"ios_xr_software","defaultStatus":"unknown","cpes":["cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.2.47:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.3.0:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.3.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.3.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.0.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.12:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.22:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.32:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.36:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.1.42:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.2.11:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.4.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.4.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.25:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.26:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.28:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.29:*:*:*:*:*:*:*","cpe:2.3:o:cisco:ios_xr:6.5.32:*:*:*:*:*:*:*","cpe:2.3:o:cisco:i

Added

SSVC

{"timestamp":"2024-08-14T15:00:29.877058Z","id":"CVE-2024-20266","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by Cisco Systems, Inc. 6/17/2026 3:06:09 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 3731 characters.
View Entire Change Record

[{"vendor":"Cisco","product":"Cisco IOS XR Software","versions":[{"version":"5.2.0","status":"affected"},{"version":"5.2.1","status":"affected"},{"version":"5.2.2","status":"affected"},{"version":"5.2.4","status":"affected"},{"version":"5.2.3","status":"affected"},{"version":"5.2.5","status":"affected"},{"version":"5.2.47","status":"affected"},{"version":"5.3.0","status":"affected"},{"version":"5.3.1","status":"affected"},{"version":"5.3.2","status":"affected"},{"version":"5.3.3","status":"affected"},{"version":"5.3.4","status":"affected"},{"version":"6.0.0","status":"affected"},{"version":"6.0.1","status":"affected"},{"version":"6.0.2","status":"affected"},{"version":"6.1.1","status":"affected"},{"version":"6.1.2","status":"affected"},{"version":"6.1.3","status":"affected"},{"version":"6.1.4","status":"affected"},{"version":"6.1.12","status":"affected"},{"version":"6.1.22","status":"affected"},{"version":"6.1.32","status":"affected"},{"version":"6.1.36","status":"affected"},{"version":"6.1.42","status":"affected"},{"version":"6.2.1","status":"affected"},{"version":"6.2.2","status":"affected"},{"version":"6.2.3","status":"affected"},{"version":"6.2.25","status":"affected"},{"version":"6.2.11","status":"affected"},{"version":"6.3.2","status":"affected"},{"version":"6.3.3","status":"affected"},{"version":"6.3.15","status":"affected"},{"version":"6.4.1","status":"affected"},{"version":"6.4.2","status":"affected"},{"version":"6.4.3","status":"affected"},{"version":"6.5.1","status":"affected"},{"version":"6.5.2","status":"affected"},{"version":"6.5.3","status":"affected"},{"version":"6.5.25","status":"affected"},{"version":"6.5.26","status":"affected"},{"version":"6.5.28","status":"affected"},{"version":"6.5.29","status":"affected"},{"version":"6.5.32","status":"affected"},{"version":"6.5.33","status":"affected"},{"version":"6.6.2","status":"affected"},{"version":"6.6.3","status":"affected"},{"version":"6.6.25","status":"affected"},{"version":"6.6.4","status":"affected"},{"version":"7.0.1","status":"affected"},{"versi

New CVE Received from Cisco Systems, Inc. 3/13/2024 1:15:47 PM

Action	Type	New Value
Added	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.
Added	CVSS V3.1	Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Added	CWE	Cisco Systems, Inc. CWE-476
Added	Reference	Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2024-20266
NVD Published Date:
03/13/2024
NVD Last Modified:
06/17/2026
Source:
Cisco Systems, Inc.

You are viewing this page in an unauthorized frame window.

Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2024-20266 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Change History

CVE Modified by CISA-ADP 6/17/2026 3:06:09 AM

CVE Modified by Cisco Systems, Inc. 6/17/2026 3:06:09 AM

CVE Modified by CVE 11/21/2024 3:52:09 AM

CVE Modified by Cisco Systems, Inc. 5/14/2024 10:50:40 AM

New CVE Received from Cisco Systems, Inc. 3/13/2024 1:15:47 PM

Quick Info