What is CVE-2017-11721?

CVE-2017-11721 is a critical-severity vulnerability in Ioquake3, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-08-03.

How severe is CVE-2017-11721?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Ioquake3

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.

Vulnerability class: Buffer Overflow

Published 2017-08-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.3th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Ioquake3

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.debian.org/security/2017/dsa-3941 (vendor-advisory)
github.com/ioquake/ioq3/commit/d2b1d124d4055c2fcbe5126863487c52fd58cca1 (Exploit, Third Party Advisory)
www.debian.org/security/2017/dsa-3948 (vendor-advisory)

Frequently asked questions

What is CVE-2017-11721?: CVE-2017-11721 is a critical-severity vulnerability in Ioquake3, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-08-03.
How severe is CVE-2017-11721?: Critical severity. CVSS v3 base score is 9.8 out of 10.