How severe is CVE-2017-9091?

CVE-2017-9091 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2017-9091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9091?

CVE-2017-9091 affects Allen Disk Project Allen Disk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9091?

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

When was CVE-2017-9091 published?

CVE-2017-9091 was published on 2017-05-19 and last updated on 2026-06-17.

CVE-2017-9091

CVE-2017-9091 is a high-severity vulnerability in Allen Disk Project Allen Disk with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Allen Disk Project Allen Disk
Published: 2017-05-19
Last modified: 2026-06-17

Description

/admin/loginc.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code']) == 1, which leads to CAPTCHA bypass by emptying $_POST['captcha'].

Frequently asked questions

What is CVE-2017-9091?: /admin/loginc.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code']) == 1, which leads to CAPTCHA bypass by emptying $_POST['captcha'].
How severe is CVE-2017-9091?: CVE-2017-9091 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2017-9091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9091?: CVE-2017-9091 affects Allen Disk Project Allen Disk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-9091 published?: CVE-2017-9091 was published on 2017-05-19 and last updated on 2026-06-17.

References

https://github.com/s3131212/allendisk/issues/23

Affected products (1)

cpe:2.3:a:allen_disk_project:allen_disk:1.6:*:*:*:*:*:*:*

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