How severe is CVE-2017-9421?

CVE-2017-9421 has a CVSS 3.x base score of 6.5, 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 low, and availability none.

Is CVE-2017-9421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9421?

CVE-2017-9421 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9421?

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

When was CVE-2017-9421 published?

CVE-2017-9421 was published on 2018-05-24 and last updated on 2026-06-17.

CVE-2017-9421

CVE-2017-9421 is a medium-severity vulnerability in Accellion Kiteworks with a CVSS 3.x base score of 6.5. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Accellion Kiteworks
Published: 2018-05-24
Last modified: 2026-06-17

Description

Authentication Bypass vulnerability in Accellion kiteworks before 2017.01.00 allows remote attackers to execute certain API calls on behalf of a web user using a gathered token via a POST request to /oauth/token.

Frequently asked questions

What is CVE-2017-9421?: Authentication Bypass vulnerability in Accellion kiteworks before 2017.01.00 allows remote attackers to execute certain API calls on behalf of a web user using a gathered token via a POST request to /oauth/token.
How severe is CVE-2017-9421?: CVE-2017-9421 has a CVSS 3.x base score of 6.5, 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 low, and availability none.
Is CVE-2017-9421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9421?: CVE-2017-9421 affects Accellion Kiteworks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-9421 published?: CVE-2017-9421 was published on 2018-05-24 and last updated on 2026-06-17.

References

https://github.com/jer1nj0y/Vulns/blob/master/Kiteworks%20Vulnerability

Affected products (1)

cpe:2.3:a:accellion:kiteworks:*:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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