SB2021022527 - Out-of-bounds write in Cisco Unidirectional Link Detection feature in FXOS and NX-OS Software
Published: February 25, 2021
Security Bulletin ID
SB2021022527
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2021-1368)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in the Unidirectional Link Detection (UDLD) feature. A remote attacker on the local network can trigger out-of-bounds write and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.