Threats / Microsoft / CVE-2017-8570
CVE-2017-8570
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Office vulnerability
Microsoft Office remote code execution vulnerability caused by improper memory object handling. Actively exploited in the wild with high EPSS score.
Verdict
Today item — known-exploited.
A memory corruption flaw in Microsoft Office allows unauthenticated remote attackers to execute arbitrary code by crafting malicious documents. Active exploitation in the wild indicates immediate risk to organizations using affected Office versions.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
16 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-25).
Probability (EPSS)
EPSS 0.89889 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Office. Confirm exact fixed builds in the vendor advisory.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious Office document containing specially formatted objects designed to trigger memory corruption when processed.
Business
End users receive seemingly legitimate Office files via email or download that silently execute attacker code upon opening.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the weaponized document through phishing, watering hole, or direct distribution to target systems running vulnerable Office software.
Business
Widespread infection risk across the organization as employees routinely open Office documents in normal business workflows.
3
Lateral reach — past segmentation narrative 3
Attacker
I gain code execution in the context of the user opening the document, establishing initial system compromise.
Business
Attackers obtain foothold for lateral movement, data exfiltration, or persistent backdoor installation within corporate networks.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05