How severe is CVE-2016-9564?

CVE-2016-9564 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 none, and availability high.

Is CVE-2016-9564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-9564?

CVE-2016-9564 affects Boa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-9564?

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-2016-9564 published?

CVE-2016-9564 was published on 2016-11-30 and last updated on 2026-06-17.

CVE-2016-9564

CVE-2016-9564 is a high-severity vulnerability in Boa 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% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Boa
Published: 2016-11-30
Last modified: 2026-06-17

Description

Buffer overflow in send_redirect() in Boa Webserver 0.92r allows remote attackers to DoS via an HTTP GET request requesting a long URI with only '/' and '.' characters.

Frequently asked questions

What is CVE-2016-9564?: Buffer overflow in send_redirect() in Boa Webserver 0.92r allows remote attackers to DoS via an HTTP GET request requesting a long URI with only '/' and '.' characters.
How severe is CVE-2016-9564?: CVE-2016-9564 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 none, and availability high.
Is CVE-2016-9564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-9564?: CVE-2016-9564 affects Boa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-9564?: 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-2016-9564 published?: CVE-2016-9564 was published on 2016-11-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:boa:boa:0.92r:*:*:*:*:*:*:*

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