🛡️ CVE-2022-35507 — proxmox-mail-gateway

🟠 CVSS 7.1 — High ⚠️ Exploit Public CWE-74 NVD
7.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interface allows a remote attacker to set cookies for a victim's browser that are longer than the server expects, causing a client-side DoS. This affects Chromium-based browsers because they allow injection of response headers with %0d. This is fixed in pve-http-server 4.1-3.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability high.

Affected software

CVE-2022-35507 is recorded against 3 packages.

  • proxmox-mail-gateway
  • pve-http-server (fixed in 4.1-3)
  • virtual-environment

Timeline and source

Published on 4 December 2022 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.proxmox.com
starlabs.sg
git.proxmox.com
starlabs.sg

Details

Severity HIGH
CVSS Score 7.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE CWE-74
Public Exploit ⚠️ Yes
Source NVD
Published 2022-12-04
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
proxmox-mail-gateway — —
pve-http-server — 4.1-3
virtual-environment — —

Similar Threats

Exploit Protection

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CVE-2022-35507 carries CVSS 7.1 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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