CVE-2026-62781: RPC Runtime Library Remote Code Execution Vulnerability

highCVSS 8.1CVE-2026-62781

Heap-based buffer overflow in RPC Runtime allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoft product: RPC Runtime Library Remote code execution Memory corruption

What: Heap-based buffer overflow in RPC Runtime allows remote code execution.
Who is affected: Unauthorized remote attackers on systems with RPC services exposed.
Urgency: High severity (CVSS 8.1); remote unauthenticated code execution is critical.
Action: Apply Microsoft security patch for CVE-2026-62781 immediately upon availability.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.1
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62781

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.

Low exploitation riskCVE-2026-627810.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62781	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for RPC Runtime Library

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.

criticalCVE-2026-69819: RPC Runtime Library Remote Code Execution Vulnerabilitymsrc · 2026-09-08