Exploited vulnerability · CISA KEV

Is CVE-2020-0796 exploited? Yes: in CISA KEV since 10 Feb 2022

Gociux · Microsoft SMBv3 · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-0796, Microsoft SMBv3 Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Feb 2022, 700 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft SMBv3. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server or client.

What to do

1. Check whether you run it. Look for SMBv3 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 12 Mar 2020.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

• nvd.nist.gov/vuln/detail/CVE-2020-0796

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 February 2022 · Microsoft scorecard · act-now radar.