How severe is CVE-2021-27101?

CVE-2021-27101 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27101 being actively exploited?

Yes. CVE-2021-27101 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-27101?

CVE-2021-27101 affects Accellion Fta. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27101?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-27101 have an EU (EUVD) identifier?

Yes. CVE-2021-27101 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-13871. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2021-27101 published?

CVE-2021-27101 was published on 2021-02-16 and last updated on 2026-06-17.

CVE-2021-27101

CVE-2021-27101 is a critical-severity vulnerability in Accellion Fta with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03).

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2021-13871
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Affected product: Accellion Fta
Published: 2021-02-16
Last modified: 2026-06-17

Description

Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to document_root.html. The fixed version is FTA_9_12_380 and later.

Frequently asked questions

What is CVE-2021-27101?: Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to document_root.html. The fixed version is FTA_9_12_380 and later.
How severe is CVE-2021-27101?: CVE-2021-27101 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27101 being actively exploited?: Yes. CVE-2021-27101 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-27101?: CVE-2021-27101 affects Accellion Fta. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27101?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-27101 have an EU (EUVD) identifier?: Yes. CVE-2021-27101 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-13871. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2021-27101 published?: CVE-2021-27101 was published on 2021-02-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:accellion:fta:*:*:*:*:*:*:*:*

More vulnerabilities in Accellion Fta

CVE-2021-27730 — Critical (CVSS 9.8): Accellion FTA 9_12_432 and earlier is affected by argument injection via a crafted POST request to an admin endpoint.…
CVE-2021-27104 — Critical (CVSS 9.8): Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin…
CVE-2021-27103 — Critical (CVSS 9.8): Accellion FTA 9_12_411 and earlier is affected by SSRF via a crafted POST request to wmProgressstat.html. The fixed…
CVE-2021-27102 — High (CVSS 7.8): Accellion FTA 9_12_411 and earlier is affected by OS command execution via a local web service call. The fixed version…
CVE-2021-27731 — Medium (CVSS 6.1): Accellion FTA 9_12_432 and earlier is affected by stored XSS via a crafted POST request to a user endpoint. The fixed…

All CVEs affecting Accellion Fta →