Exploited vulnerability · CISA KEV

Is CVE-2021-27101 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2021-27101, Accellion FTA SQL Injection 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.

exploitedYesCISA KEV · 3 Nov 2021

ransomwareKnownused in campaigns

EPSStop 10%more likely than most to be exploited

severity9.8CVSS 3.1 · critical

US federal due17 Nov 2021BOD 22-01 deadline

What it is

Accellion FTA contains a SQL injection vulnerability exploited via a crafted host header in a request to document_root.html.

Vendor	Accellion (4 exploited CVEs in KEV)
Product	FTA
Vulnerability	Accellion FTA SQL Injection Vulnerability
Weakness	CWE-89, CWE-138
Published	16 Feb 2021
Added to KEV	3 Nov 2021
Reported by (CNA)	mitre

What to do

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.
Apply the fix. Apply updates per vendor instructions.
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.
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-2021-27103: Accellion FTA Server-Side Request Forgery (SSRF) Vulnerability (3 Nov 2021)

References

nvd.nist.gov/vuln/detail/CVE-2021-27101

Questions

Is CVE-2021-27101 being exploited?

Yes. CISA added CVE-2021-27101 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-27101 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2021-27101?

Apply updates per vendor instructions. Check Accellion's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected FTA 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 November 2021 · Accellion scorecard · act-now radar.

Running Accellion in a regulated environment?

We check exposure across your estate, patch or mitigate with your team, and set up detection for what attackers do after exploiting it.

Get in touch →