Exploited vulnerability · CISA KEV

Is CVE-2021-20016 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · SonicWall SSLVPN SMA100 · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-20016, SonicWall SSLVPN SMA100 SQL Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 273 days after it was published. It is known to be used in ransomware campaigns. It affects SonicWall SSLVPN SMA100, 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 SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.

What to do

1. Check whether you run it. Look for SSLVPN SMA100 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 3 Feb 2021.
4. Get told next time. Email alerts when CISA adds a CVE for SonicWall.

References

• nvd.nist.gov/vuln/detail/CVE-2021-20016

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 November 2021 · SonicWall scorecard · act-now radar.