Threats / Microsoft / CVE-2015-1770
CVE-2015-1770
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Office vulnerability
Microsoft Office remote code execution vulnerability in crafted documents. EPSS 0.797 indicates high exploitation likelihood; confirmed active exploitation in the wild.
Verdict
Today item — known-exploited.
Remote attackers can execute arbitrary code by delivering malicious Office documents to targets. The vulnerability class (CWE-19: Improper Input Validation) enables document parsing bypass, leading to code execution without user interaction beyond opening a file.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 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 2022-03-28).
Probability (EPSS)
EPSS 0.35105 — 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.
Weakness (CWE)
Mapped to CWE-19 CWE-19.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
WeaknessCWE-19 · CWE-19
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 exploit payload and distribute it via email or web.
Business
End users receive seemingly legitimate documents that execute attacker code upon opening, compromising individual workstations.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I gain code execution in the context of the Office application process on the target system.
Business
Attacker obtains initial access to corporate networks, potentially escalating to lateral movement and data exfiltration.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence or deploy secondary payloads from the compromised Office process.
Business
Organization faces sustained compromise, credential theft, and operational disruption across affected user base.
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