Security Resilience

CVE-2023-43320

Proxmox Backup Server 1.1 – 3.0

Public PoC
Published
27 September 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.014 72th percentile
Risk Priority 69 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-43320 is a high-severity an unspecified weakness vulnerability in Proxmox Backup Server. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 28% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

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.

CWE(s)
NVD-CWE-noinfo

Related Threats

CVEs Like This One

CVE-2025-57539Same product: Proxmox Virtual Environment
CVE-2025-57538Same product: Proxmox Virtual Environment
CVE-2025-57540Same product: Proxmox Virtual Environment
CVE-2026-51080Same product class: hypervisor / virtualization
CVE-2023-46854Same product class: hypervisor / virtualization
CVE-2024-0092Same product class: hypervisor / virtualization
CVE-2020-3992Same product class: hypervisor / virtualization
CVE-2026-41723Same product class: hypervisor / virtualization
CVE-2024-22252Same product class: hypervisor / virtualization
CVE-2023-34056Same product class: hypervisor / virtualization

Affected Assets

proxmox
backup server
1.1 — 3.0
proxmox
proxmox mail gateway
7.1 — 8.0
proxmox
virtual environment
5.4 — 8.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References