Proxmox Virtual Environment/Mail Gateway Response Header injection

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Proxmox Virtual Environment and Mail Gateway. It has been classified as critical. The impacted element is an unknown function of the component Response Header Handler. The manipulation leads to injection. This vulnerability is listed as CVE-2022-35507. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Proxmox Virtual Environment and Mail Gateway (unknown version). It has been rated as critical. This issue affects an unknown code block of the component Response Header Handler. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented 12/05/2022. The advisory is shared at starlabs.sg. The identification of this vulnerability is CVE-2022-35507 since 07/11/2022. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading eliminates this vulnerability. Applying the patch 936007ae0241811093155000486da171379c23c2 is able to eliminate this problem. The bugfix is ready for download at git.proxmox.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2022-38395). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Injection
CWE: CWE-74 / CWE-707 / CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: 936007ae0241811093155000486da171379c23c2

Timelineinfo

07/11/2022 🔍
12/05/2022 +147 days 🔍
12/05/2022 +0 days 🔍
06/15/2026 +1288 days 🔍

Sourcesinfo

Advisory: starlabs.sg
Status: Confirmed

CVE: CVE-2022-35507 (🔍)
GCVE (CVE): GCVE-0-2022-35507
GCVE (VulDB): GCVE-100-214793
EUVD: 🔍

Entryinfo

Created: 12/05/2022 08:19
Updated: 06/15/2026 15:43
Changes: 12/05/2022 08:19 (39), 12/26/2022 09:30 (11), 04/25/2025 06:00 (16), 06/15/2026 15:43 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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