Fiche vulnérabilité
CVE-2021-34793 : faille élevée cisco adaptive security appliance (CVSS 8.6)
Description
A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption.
En bref
- Sévérité
- Élevée (CVSS 8.6)
- Vecteur CVSS
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Exploitation active
- Non signalée par la CISA
- Publication
- 27 oct. 2021
- Dernière mise à jour
- 11 août 2026
Produits concernés
- cisco adaptive security appliance
- cisco secure firewall threat defense
- cisco adaptive security appliance software
- cisco asa 5512-x firmware
- cisco asa 5505 firmware
- cisco asa 5515-x firmware
- cisco asa 5525-x firmware
- cisco asa 5545-x firmware
- cisco asa 5555-x firmware
- cisco asa 5580 firmware
- cisco asa 5585-x firmware