Exploited vulnerability · CISA KEV

Is CVE-2021-27103 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Accellion FTA · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-27103, Accellion FTA Server-Side Request Forgery (SSRF) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 260 days after it was published. It is known to be used in ransomware campaigns. It affects Accellion FTA. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Accellion FTA contains a server-side request forgery (SSRF) vulnerability exploited via a crafted POST request to wmProgressstat.html.

What to do

1. Check whether you run it. Look for FTA in your asset inventory, including appliances and cloud images. Stack check lists every exploited Accellion 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 16 Feb 2021.
4. Get told next time. Email alerts when CISA adds a CVE for Accellion.

Other exploited CVEs in FTA

• CVE-2021-27104: Accellion FTA OS Command Injection Vulnerability (3 Nov 2021)
• CVE-2021-27102: Accellion FTA OS Command Injection Vulnerability (3 Nov 2021)
• CVE-2021-27101: Accellion FTA SQL Injection Vulnerability (3 Nov 2021)

References

• nvd.nist.gov/vuln/detail/CVE-2021-27103

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 · Accellion scorecard · act-now radar.