Exploited vulnerability · CISA KEV

Is CVE-2021-20038 exploited? Yes: in CISA KEV since 28 Jan 2022

Gociux · SonicWall SMA 100 Appliances · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-20038, SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 28 Jan 2022, 51 days after it was published. It is known to be used in ransomware campaigns. It affects SonicWall SMA 100 Appliances, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.

What to do

1. Check whether you run it. Look for SMA 100 Appliances in your asset inventory, including appliances and cloud images. Stack check lists every exploited SonicWall 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 Dec 2021.
4. Get told next time. Email alerts when CISA adds a CVE for SonicWall.

References

• nvd.nist.gov/vuln/detail/CVE-2021-20038

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 January 2022 · SonicWall scorecard · act-now radar.