What’s Vulnerable › Vulnerabilities

CVE-2023-43320

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-27 · updated 2026-06-17

Description

An issue in Proxmox Server Solutions GmbH Proxmox VE v.5.4 thru v.8.0, Proxmox Backup Server v.1.1 thru v.3.0, and Proxmox Mail Gateway v.7.1 thru v.8.0 allows a remote authenticated attacker to escalate privileges via bypassing the two-factor authentication component.

Affected products

• Proxmox Backup Server: from 1.1 through 3.0
• Proxmox Mail Gateway: from 7.1 through 8.0
• Proxmox Virtual Environment: from 5.4 through 8.0

References

• http://packetstormsecurity.com/files/176967/Proxmox-VE-7.4-1-TOTP-Brute-Force.html
• https://bugzilla.proxmox.com/show_bug.cgi?id=4579
• https://bugzilla.proxmox.com/show_bug.cgi?id=4584
• https://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cb
• http://packetstormsecurity.com/files/176967/Proxmox-VE-7.4-1-TOTP-Brute-Force.html
• https://bugzilla.proxmox.com/show_bug.cgi?id=4579
• https://bugzilla.proxmox.com/show_bug.cgi?id=4584
• https://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cb

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