Exploitation ongoing with high activity in latest observed window (1 mentions)
Recommended action window: Immediate (within 24h)
NVD description
Microsoft Outlook Remote Code Execution Vulnerability
Priority
MEDIUM
Exploitation
ACTIVE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
4 versions affected across 4 products
| Date | Total | Labels |
|---|
| 2026-07-27 | 1 | Patch1 |
| 2026-10-17 | 1 | Active Exploitation1 |
CISA's emergency directive on CVE-2024-21378 should be on every CISO's radar. Outlook RCE flaws demand immediate patching. Attackers aren't waiting for your change window.
Post summary
CISA’s emergency directive for CVE‑2024‑21378 warns of an Outlook RCE flaw and urges rapid patching, with no PoC, exploit, or confirmed active exploitation cited.
Microsoft Outlook CVE-2024-21378 is a critical RCE being actively exploited. If your SOC isn't hunting for this IOC pattern, you're already behind. We're on it.
Post summary
The text warns that Microsoft Outlook CVE-2024-21378 is a critical RCE actively exploited in the wild and urges SOC teams to hunt for related IOCs.
4 of 4 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | microsoft | 365_apps | - | - | - |
| App | microsoft | office | 2019 | - | - |
| App | microsoft | office_long_term_servicing_channel | 2021 | - | - |
| App | microsoft | outlook | 2016 | - | - |