Description
iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.
Published: 2026-09-30
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 02 Oct 2026 09:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 01 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Es
Es iperf3
Vendors & Products Es
Es iperf3

Wed, 30 Sep 2026 23:15:00 +0000

Type Values Removed Values Added
Title Remote unauthenticated heap use‑after‑free in iperf3 3.21

Wed, 30 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
Description iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Anthropic

Published:

Updated: 2026-10-01T15:51:00.728Z

Reserved: 2026-09-28T11:52:18.066Z

Link: CVE-2026-101276

cve-icon Vulnrichment

Updated: 2026-10-01T15:50:56.464Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-30T21:16:54.913

Modified: 2026-10-01T16:17:32.020

Link: CVE-2026-101276

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T15:30:08Z

Weaknesses