CVE-2017-11721: Buffer overflow in ioquake3 before 2017-08-02 allows remote attackers to cause a denial of service (applicatio

Q: How do I fix CVE-2017-11721?

ioquake3: upgrade to newer than 2017-07-31. Exact commands for each OS are on this page.

Q: Is CVE-2017-11721 being exploited?

CVE-2017-11721 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-11721 affect?

CVE-2017-11721 affects ioquake3. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2017-11721?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2017-11721 is a critical-severity flaw (CVSS 9.8) affecting ioquake3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-08-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ioquake3

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-08-03 08:29 UTCPublished CVE record published
2026-06-17 01:02 UTCUpdated Record last modified

ioquake3 ioquake3 UPGRADE

Affected: <= 2017-07-31

Fixed in: newer than 2017-07-31

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ioquake3 || rpm -q ioquake3 || ioquake3 --version

2. UPGRADE to newer than 2017-07-31 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ioquake3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ioquake3

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-11721?

ioquake3: upgrade to newer than 2017-07-31. Exact commands for each OS are on this page.

Is CVE-2017-11721 being exploited?

CVE-2017-11721 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-11721 affect?

CVE-2017-11721 affects ioquake3. Severity is critical (CVSS 9.8). 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 urgent is CVE-2017-11721?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-6903 HIGH 7.8 UPGRADE In ioquake3 before 2017-03-14, the auto-downloading feature has insufficient content restrictions

References

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