Vulnerability in Avira Phantom Vpn
CVE-2023-36673
An issue was discovered in Avira Phantom VPN through 2.23.1 for macOS. The VPN client insecurely configures the operating system such that all IP traffic to the VPN server's IP address is sent in plaintext outside the VPN tunnel, even if this traffic is not generated by the VPN client, while simultaneously using plaintext DNS to look up the VPN server's IP address. This allows an adversary to trick the victim into sending traffic to arbitrary IP addresses in plaintext outside the VPN tunnel. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "ServerIP attack, combined with DNS spoofing, that can leak traffic to an arbitrary IP address" rather than to only Avira Phantom VPN.
EPSS: 0.006 (46.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Avira Phantom_vpn
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Product)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org
Frequently asked questions
- What is CVE-2023-36673?
- CVE-2023-36673 is a high-severity vulnerability in Avira Phantom Vpn, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.3/10. Published 2023-08-09.
- How severe is CVE-2023-36673?
- High severity. CVSS v3 base score is 7.3 out of 10.