CVE-2023-43320

HIGH 8.8CVE-2023-43320 · Published 27/09/2023 · updated 17/06/2026

In short

CVE-2023-43320 is a HIGH (CVSS 8.8) vulnerability affecting backup server (proxmox), proxmox mail gateway (proxmox), virtual environment (proxmox).
Chance of exploitation in the next 30 days (EPSS): 1.4%, higher than 72.2% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
backup server proxmox	`≥ 1.1, ≤ 3.0`	No fix yet
proxmox mail gateway proxmox	`≥ 7.1, ≤ 8.0`	No fix yet
virtual environment proxmox	`≥ 5.4, ≤ 8.0`	No fix yet

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.

References

packetstormsecurity.com/files/176967/Proxmox-VE-7.4-1-TOTP-Brute-Force.html
bugzilla.proxmox.com/show_bug.cgi · Issue Tracking
bugzilla.proxmox.com/show_bug.cgi · Issue Tracking
proxmox/proxmox-rs commit 50b793d · Patch

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