How severe is CVE-2019-5623?

CVE-2019-5623 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-2019-5623 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5623?

CVE-2019-5623 affects Accellion File Transfer Appliance. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5623?

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-2019-5623 published?

CVE-2019-5623 was published on 2020-04-29 and last updated on 2026-06-17.

CVE-2019-5623

CVE-2019-5623 is a critical-severity vulnerability in Accellion File Transfer Appliance 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Accellion File Transfer Appliance
Published: 2020-04-29
Last modified: 2026-06-17

Description

Accellion File Transfer Appliance version FTA_8_0_540 suffers from an instance of CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').

Frequently asked questions

What is CVE-2019-5623?: Accellion File Transfer Appliance version FTA_8_0_540 suffers from an instance of CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
How severe is CVE-2019-5623?: CVE-2019-5623 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-2019-5623 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5623?: CVE-2019-5623 affects Accellion File Transfer Appliance. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5623?: 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-2019-5623 published?: CVE-2019-5623 was published on 2020-04-29 and last updated on 2026-06-17.

References

https://www.rapid7.com/db/modules/exploit/linux/misc/accellion_fta_mpipe2

Affected products (1)

cpe:2.3:a:accellion:file_transfer_appliance:8_0_540:*:*:*:*:*:*:*

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