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Exploited vulnerability · CISA KEV

Is CVE-2019-0703 exploited? Yes: in CISA KEV since 23 May 2022

Gociux · Microsoft Windows · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-0703, Microsoft Windows SMB Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 May 2022, 1141 days after it was published. It affects Microsoft Windows. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 23 May 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.5CVSS 3.1 · medium
US federal due13 Jun 2022BOD 22-01 deadline

What it is

An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests, which could lead to information disclosure from the server.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWindows
VulnerabilityMicrosoft Windows SMB Information Disclosure Vulnerability
Weaknessnot specified
Published8 Apr 2019
Added to KEV23 May 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Windows in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 8 Apr 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

References

Questions

Is CVE-2019-0703 being exploited?

Yes. CISA added CVE-2019-0703 to the Known Exploited Vulnerabilities catalog on 23 May 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-0703 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2019-0703?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2022 · Microsoft scorecard · act-now radar.

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