PT-2021-4049 · Cisco · Cisco Ios Xr
Published
2021-09-08
·
Updated
2021-09-22
·
CVE-2021-34737
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Cisco IOS XR Software (affected versions not specified)
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 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.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
DoS
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Cisco Ios Xr