Riskcovery

CVE-2026-71217

Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion

State
Published
Severity
7.5 High
Published
Aug 11, 2026
Updated
Aug 31, 2026
Reserved
Aug 5, 2026

Read the record on cve.org

Description

A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat

Weaknesses

  • CWE-20 Improper Input Validation

Affected Products

ProductVersions
Red Hat Enterprise Linux 10Red Hat
  • 0:3.17.1-6.el10_2.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:3.5-12.el8_10.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:3.9-17.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 7Red Hat

    References

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