How severe is CVE-2016-9499?

CVE-2016-9499 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2016-9499 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-9499?

CVE-2016-9499 affects Accellion Ftp Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-9499?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-9499 published?

CVE-2016-9499 was published on 2018-07-13 and last updated on 2026-06-17.

CVE-2016-9499

CVE-2016-9499 is a medium-severity vulnerability in Accellion Ftp Server with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Accellion Ftp Server
Published: 2018-07-13
Last modified: 2026-06-17

Description

Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.

Frequently asked questions

What is CVE-2016-9499?: Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.
How severe is CVE-2016-9499?: CVE-2016-9499 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2016-9499 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-9499?: CVE-2016-9499 affects Accellion Ftp Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-9499?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-9499 published?: CVE-2016-9499 was published on 2018-07-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:accellion:ftp_server:*:*:*:*:*:*:*:*

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