Out-of-bounds read in Cisco Systems, Inc products - CVE-2021-1588
Published: August 26, 2021
Vulnerability identifier: #VU56115
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1588
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in the MPLS Operation, Administration, and Maintenance (OAM) feature. A remote attacker can send a specially crafted MPLS echo-request or echo-reply packet, trigger out-of-bounds read error and cause a denial of service condition on the system.
Affected software
Cisco Nexus 3000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches NX-OS Mode
Cisco NX-OS
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches NX-OS Mode
Cisco NX-OS
How to mitigate CVE-2021-1588
Install updates from vendor's website.
Cisco NX-OS - addressed in versions 7.0.3 I7.9, 9.3.7a