CVE-2017-11721

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

August 3, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Sep 22, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit d2b1d124d405 (ioquake/ioq3)

Fix landed in ioquake/ioq3 commit d2b1d124d405 — awaiting tagged release

https://github.com/ioquake/ioq3/commit/d2b1d124d4055c2fcbe5126863487c52fd58cca1
generic

[SECURITY] [DSA 3948-1] ioquake3 security update

http://www.debian.org/security/2017/dsa-3948
generic

[SECURITY] [DSA 3940-1] iortcw security update

http://www.debian.org/security/2017/dsa-3941

Affected Packages

(11 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
ioquake3—1.36+u20170803+dfsg1-1—
iortcw1.42b+20150930+dfsg1-1 ... 1.51+dfsg1-2 (12 versions)1.51+dfsg1-3—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
ioquake3—1.36+u20170803+dfsg1-1—
iortcw1.42b+20150930+dfsg1-1 ... 1.51+dfsg1-2 (12 versions)1.51+dfsg1-3—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
ioquake3—1.36+u20170803+dfsg1-1—
iortcw1.42b+20150930+dfsg1-1 ... 1.51+dfsg1-2 (12 versions)1.51+dfsg1-3—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
ioquake3—1.36+u20170803+dfsg1-1—
iortcw1.42b+20150930+dfsg1-1 ... 1.51+dfsg1-2 (12 versions)1.51+dfsg1-3—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
ioquake31.36+u20161101+dfsg1-21.36+u20161101+dfsg1-2+deb9u1—
iortcw1.42b+20150930+dfsg1-1 ... 1.50a+dfsg1-3 (10 versions)1.50a+dfsg1-3+deb9u1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
ioquake31.36+u20140802+gca9eebb-2, 1.36+u20140802+gca9eebb-2+deb8u11.36+u20140802+gca9eebb-2+deb8u2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 153 total refreshes for this CVE.

  1. 2026-09-24 13:59 UTCEPSS rescore
  2. 2026-09-19 15:36 UTCEPSS rescore
  3. 2026-09-18 19:22 UTCEPSS rescore
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  5. 2026-09-15 07:25 UTCOSV refresh
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  20. 2026-08-27 07:04 UTCOSV refresh
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  1. 2026-08-19 16:59 UTCEPSS rescore
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  7. 2026-08-13 21:56 UTCEPSS rescore
  8. 2026-08-10 20:38 UTCOSV refresh
  9. 2026-08-09 13:42 UTCEPSS rescore
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  21. 2026-07-28 15:32 UTCEPSS rescore
  22. 2026-07-26 14:51 UTCEPSS rescore
  23. 2026-07-25 20:31 UTCOSV refresh
  24. 2026-07-25 14:13 UTCEPSS rescore
  25. 2026-07-23 14:15 UTCEPSS rescore
  26. 2026-07-23 01:26 UTCEG score recompute
  27. 2026-07-22 22:05 UTCEG score recompute
  28. 2026-07-22 14:04 UTCEPSS rescore
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  46. 2026-07-11 08:24 UTCEPSS rescore
  47. 2026-07-09 19:06 UTCEPSS rescore
  48. 2026-07-08 15:15 UTCOSV refresh
  49. 2026-07-08 15:10 UTCEPSS rescore
  50. 2026-07-07 13:42 UTCEPSS rescore
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  73. 2026-06-20 03:12 UTCOSV refresh
  74. 2026-06-19 19:23 UTCEPSS rescore
  75. 2026-06-19 19:23 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2017-11721?
CVE-2017-11721 is a critical vulnerability published on August 3, 2017. 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.
When was CVE-2017-11721 disclosed?
CVE-2017-11721 was first published in the National Vulnerability Database on August 3, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-11721 actively exploited?
CVE-2017-11721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.9% of all scored CVEs.
What is the CVSS score of CVE-2017-11721?
CVE-2017-11721 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-11721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-11721, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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