How severe is CVE-2021-27730?

CVE-2021-27730 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-2021-27730 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27730?

CVE-2021-27730 affects Accellion Fta. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27730?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-27730 published?

CVE-2021-27730 was published on 2021-03-02 and last updated on 2026-06-17.

CVE-2021-27730

CVE-2021-27730 is a critical-severity vulnerability in Accellion Fta with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Accellion Fta
Published: 2021-03-02
Last modified: 2026-06-17

Description

Accellion FTA 9_12_432 and earlier is affected by argument injection via a crafted POST request to an admin endpoint. The fixed version is FTA_9_12_444 and later.

Frequently asked questions

What is CVE-2021-27730?: Accellion FTA 9_12_432 and earlier is affected by argument injection via a crafted POST request to an admin endpoint. The fixed version is FTA_9_12_444 and later.
How severe is CVE-2021-27730?: CVE-2021-27730 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-2021-27730 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27730?: CVE-2021-27730 affects Accellion Fta. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27730?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27730 published?: CVE-2021-27730 was published on 2021-03-02 and last updated on 2026-06-17.

References

https://github.com/accellion/CVEs/blob/main/CVE-2021-27730.txt

Affected products (1)

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

More vulnerabilities in Accellion Fta

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-2021-27101 — Critical (CVSS 9.8): Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to…
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…

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