CVE-2021-34737 — NULL Pointer Dereference in Cisco IOS XR

CWE-476 — NULL Pointer Dereference4 documents4 sources
Severity
7.5HIGHNVD
CNA5.8
EPSS
0.4%
top 38.06%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Cisco IOS XRCisco IOS XR Software
Timeline
PublishedSep 9
Latest updateMay 24

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 a…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

▶NVDcisco/ios_xr7.4.0 — 7.4.1+2

🔴Vulnerability Details

2
GHSA
GHSA-x6m9-rgr7-fm6p: A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a cr↗2022-05-24
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CVEList
Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability↗2021-09-09
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📋Vendor Advisories

1
Cisco
Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability↗2021-09-08
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CVE-2021-34737 — NULL Pointer Dereference in Cisco | cvebase