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Public proof of conceptFix available

CVE-2022-35507

A public proof of concept exists; no exploitation attested.

  • Published2022-12-04
  • WeaknessCWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-12-0419:15CVE publishedNVD

Versions per branch

NVD
Proxmox proxmox mail gateway
BranchAffectedFixed in
—all versionsno fix published
Proxmox pve http server
BranchAffectedFixed in
4.1< 4.1-34.1-3
Proxmox virtual environment
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

read 2026-11-09 09:28 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Published
2022-12-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-xfgp-gpjw-wmqr

Frequently asked questions

What is CVE-2022-35507?

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.

Is CVE-2022-35507 actively exploited?

A proof-of-concept exploit exists for CVE-2022-35507, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-35507?

CVE-2022-35507 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.

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Sources for this record