How severe is CVE-2017-11309?

CVE-2017-11309 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11309 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11309?

CVE-2017-11309 affects Avaya Ip Office. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-11309?

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-2017-11309 published?

CVE-2017-11309 was published on 2017-11-10 and last updated on 2026-06-17.

CVE-2017-11309

CVE-2017-11309 is a critical-severity vulnerability in Avaya Ip Office with a CVSS 3.x base score of 9.6. 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-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 6.8
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Avaya Ip Office
Published: 2017-11-10
Last modified: 2026-06-17

Description

Buffer overflow in the SoftConsole client in Avaya IP Office before 10.1.1 allows remote servers to execute arbitrary code via a long response.

Frequently asked questions

What is CVE-2017-11309?: Buffer overflow in the SoftConsole client in Avaya IP Office before 10.1.1 allows remote servers to execute arbitrary code via a long response.
How severe is CVE-2017-11309?: CVE-2017-11309 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11309 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11309?: CVE-2017-11309 affects Avaya Ip Office. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-11309?: 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-2017-11309 published?: CVE-2017-11309 was published on 2017-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:avaya:ip_office:*:*:*:*:*:*:*:*

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