Threats / Microsoft / CVE-2019-0703
CVE-2019-0703
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
An information disclosure vulnerability in Windows SMB Server allows attackers to extract sensitive data through specially crafted requests.
Verdict
Today item — known-exploited.
This vulnerability enables unauthenticated or low-privileged attackers to read sensitive information from affected Windows systems via the SMB protocol. Active exploitation in the wild increases risk despite moderate EPSS score.
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 2022-05-23).
Probability (EPSS)
EPSS 0.0964 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. 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 malicious SMB requests targeting the vulnerable server handler to trigger information leakage.
Business
Sensitive data stored on file servers becomes accessible to external threat actors without authentication.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I extract confidential files, credentials, or system metadata from the compromised SMB share.
Business
Intellectual property, customer data, and internal communications are exposed, creating compliance and reputation risk.
3
Lateral reach — past segmentation narrative 3
Attacker
I use harvested credentials or system information to pivot deeper into the network infrastructure.
Business
Initial compromise escalates into broader lateral movement and potential system takeover across the enterprise.
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