[UPDATE] [medium] Red Hat Virtualization: Multiple vulnerabilities allow Denial of Service

mediumCVE-2021-33623 CVE-2021-35515 CVE-2021-35516 CVE-2021-35517 CVE-2021-36090 CVE-2021-3807

A remote, anonymous attacker can exploit multiple vulnerabilities in Red Hat Virtualization to conduct a Denial of Service attack or disclose information.

CSIRTS triage

vendor: Red Hat product: Red Hat Virtualization Denial of service Information disclosure

What: A remote, anonymous attacker can exploit multiple vulnerabilities in Red Hat Virtualization to conduct a Denial of Service attack or disclose information.
Who is affected: Deployments of Red Hat Virtualization.
Urgency: Remediation is medium urgency due to the potential for denial-of-service and information disclosure.
Action: Update to the latest version of Red Hat Virtualization.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2022-0699

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Moderate exploitation riskCVE-2021-336232.9% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 86% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2021-3551511.6% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2021-3551612.4% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2021-3551710.6% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 95% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2021-3609012.9% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2021-38073.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 88% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2022-2295036.1% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 98% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2022-310511.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 75% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2021-33623	coverage & exploitation status	NVD · CVE.org
CVE-2021-35515	coverage & exploitation status	NVD · CVE.org
CVE-2021-35516	coverage & exploitation status	NVD · CVE.org
CVE-2021-35517	coverage & exploitation status	NVD · CVE.org
CVE-2021-36090	coverage & exploitation status	NVD · CVE.org
CVE-2021-3807	coverage & exploitation status	NVD · CVE.org
CVE-2022-22950	coverage & exploitation status	NVD · CVE.org
CVE-2022-31051	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Red Hat FUSE: Multiple vulnerabilitiescert-bund

Recent advisories for Red Hat Virtualization

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[UPDATE] [medium] Red Hat Virtualization: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-08-21