HOMEVULNERABILITIESCVE-2023-43320
HIGH

CVE-2023-43320

NVD-CWE-noinfoPublished: September 27, 2023· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-43320 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

proxmox3 product(s)
backup serverproxmox mail gatewayvirtual environment
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cb
PATCHhttps://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cb
ADVISORYhttps://bugzilla.proxmox.com/show_bug.cgi?id=4579
ADVISORYhttps://bugzilla.proxmox.com/show_bug.cgi?id=4584
ADVISORYhttps://bugzilla.proxmox.com/show_bug.cgi?id=4579
ADVISORYhttps://bugzilla.proxmox.com/show_bug.cgi?id=4584

All References (8)

→
http://packetstormsecurity.com/files/176967/Proxmox-VE-7.4-1-TOTP-Brute-Force.html
→
https://bugzilla.proxmox.com/show_bug.cgi?id=4579Issue Tracking · Vendor Advisory
→
https://bugzilla.proxmox.com/show_bug.cgi?id=4584Issue Tracking · Vendor Advisory
→
https://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cbPatch
→
http://packetstormsecurity.com/files/176967/Proxmox-VE-7.4-1-TOTP-Brute-Force.html
→
https://bugzilla.proxmox.com/show_bug.cgi?id=4579Issue Tracking · Vendor Advisory
→
https://bugzilla.proxmox.com/show_bug.cgi?id=4584Issue Tracking · Vendor Advisory
→
https://github.com/proxmox/proxmox-rs/commit/50b793db8d3421bbfe2bce060a486263f18a90cbPatch

Quick Facts

CVE IDCVE-2023-43320
CVSS Score8.8 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedSep 27, 2023

Related CVEs (NVD-CWE-noinfo)

CVE-2017-14470
10.0
CVE-2017-14472
10.0
CVE-2018-4091
10.0
CVE-2017-14469
10.0
CVE-2017-14471
10.0
CVE-2017-14473
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-43320 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2023-43320·NVD