CVE-2026-7840
A remote, anonymous attacker can exploit multiple vulnerabilities in UltraVNC to execute arbitrary code, disclose confidential information, manipulate data, and cause a denial of service.
CSIRTS triage
- What
- A remote, anonymous attacker can exploit multiple vulnerabilities in UltraVNC to execute arbitrary code, disclose confidential information, manipulate data, and cause a denial of service.
- Who is affected
- Deployments of UltraVNC.
- Urgency
- Remediation is high urgency due to the severity of the vulnerabilities and potential impacts.
- Action
- Apply patches or updates as soon as they are available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk1.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 70% of all EPSS-scored CVEs.
Advisory coverage (2)
- high[NEW] [high] UltraVNC: Multiple vulnerabilitiescert-bund · 2026-07-01
- criticalCVE-2026-7840: UltraVNC repeater through 1.8.2.2 contains a global buffer overflow in its embedded HTTP admini…nvd · 2026-07-01
External references
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