Executive Summary

Informations
Name CVE-2021-34737 First vendor Publication 2021-09-09
Vendor Cve Last vendor Modification 2024-11-21

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 7.5
Base Score 7.5 Environmental Score 7.5
impact SubScore 3.6 Temporal Score 7.5
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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 NULL pointer dereference, resulting in a crash of the dhcpd process. While the dhcpd process is restarting, which may take up to 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. Note: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34737

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-476 NULL Pointer Dereference

CPE : Common Platform Enumeration

TypeDescriptionCount
Hardware 1
Os 294

Sources (Detail)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-s...
Source Url

Alert History

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Date Informations
2024-11-28 13:57:55
  • Multiple Updates
2024-10-09 02:22:30
  • Multiple Updates
2024-10-08 02:22:50
  • Multiple Updates
2024-10-03 13:19:05
  • Multiple Updates
2024-07-26 02:18:29
  • Multiple Updates
2023-11-07 21:34:03
  • Multiple Updates
2023-09-20 02:12:42
  • Multiple Updates
2022-05-05 01:58:11
  • Multiple Updates
2021-11-06 12:50:01
  • Multiple Updates
2021-09-22 21:23:21
  • Multiple Updates
2021-09-09 12:44:14
  • First insertion