SB2021102806 - Denial of service in SSL/TLS implementation in Cisco Adaptive Security Appliance and Firepower Threat Defense
Published: October 28, 2021
Security Bulletin ID
SB2021102806
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2021-40117)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing SSL/TLS packets in SSL VPN interface. A remote attacker can send a specially crafted HTTPS request, trigger memory corruption and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.