CVE-2023-20070
CVE-2023-20070
In short
A flaw in Cisco Firepower Threat Defense's TLS 1.3 handling can crash the detection engine when an attacker sends specially crafted messages, briefly blocking traffic inspection until it restarts automatically.
Technical detail
A logic error in TLS 1.3 memory allocation handling in Cisco FTD allows an unauthenticated remote attacker to trigger Snort 3 engine restart via crafted message sequences under specific timing conditions, resulting in temporary denial of service and packet loss until automatic recovery.
Summary generated and translated by AI from the official description.
A vulnerability in the TLS 1.3 implementation of the Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 detection engine to unexpectedly restart. This vulnerability is due to a logic error in how memory allocations are handled during a TLS 1.3 session. Under specific, time-based constraints, an attacker could exploit this vulnerability by sending a crafted TLS 1.3 message sequence through an affected device. A successful exploit could allow the attacker to cause the Snort 3 detection engine to reload, resulting in a denial of service (DoS) condition. While the Snort detection engine reloads, packets going through the FTD device that are sent to the Snort detection engine will be dropped. The Snort detection engine will restart automatically. No manual intervention is required.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
Affected products
Cisco · Cisco Firepower Threat Defense SoftwareWant to know if your infrastructure is exposed to this?
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