VULNERABILITY INTELLIGENCE

CVE-2023-20275

CVSS score4.1 MEDIUM
EPSS probability0.42%
CISA KEVNot currently listed
Published2023-12-12
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Description

A vulnerability in the AnyConnect SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to send packets with another VPN user's source IP address. This vulnerability is due to improper validation of the packet's inner source IP address after decryption. An attacker could exploit this vulnerability by sending crafted packets through the tunnel. A successful exploit could allow the attacker to send a packet impersonating another VPN user's IP address. It is not possible for the attacker to receive return packets.

Weakness classification

  • psirt@cisco.com: CWE-346
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references