How severe is CVE-2017-11721?

CVE-2017-11721 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11721?

CVE-2017-11721 affects Ioquake3. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-11721?

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-2017-11721 published?

CVE-2017-11721 was published on 2017-08-03 and last updated on 2026-06-17.

CVE-2017-11721

CVE-2017-11721 is a critical-severity vulnerability in Ioquake3 with a CVSS 3.x base score of 9.8. 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 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Ioquake3
Published: 2017-08-03
Last modified: 2026-06-17

Description

Buffer overflow in ioquake3 before 2017-08-02 allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted packet.

Frequently asked questions

What is CVE-2017-11721?: Buffer overflow in ioquake3 before 2017-08-02 allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted packet.
How severe is CVE-2017-11721?: CVE-2017-11721 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11721?: CVE-2017-11721 affects Ioquake3. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-11721?: 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-2017-11721 published?: CVE-2017-11721 was published on 2017-08-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ioquake3:ioquake3:*:*:*:*:*:*:*:*

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