CVE-2022-35507

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2022-12-04. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
68.9%
KEV
Not listed

Published

December 4, 2022

Last Modified

April 24, 2025

References (4)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:44 UTCEPSS rescore
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  56. 2026-05-25 11:16 UTCEG score recompute
  57. 2026-05-25 11:16 UTCGHSA enrichment
  58. 2026-05-24 16:51 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2022/CVE-2022-35507.yaml
    First seen Jan 1, 2022

    Proxmox - CRLF Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2022-35507?
CVE-2022-35507 is a high vulnerability published on December 4, 2022. 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…
When was CVE-2022-35507 disclosed?
CVE-2022-35507 was first published in the National Vulnerability Database on December 4, 2022, with the most recent update on April 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-35507 actively exploited?
CVE-2022-35507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-35507?
CVE-2022-35507 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2022-35507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-35507, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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