CVE-2026-71217Public exploitNetwork attack vectorHinoki check available

Remote service interruption via unbounded control parameters

Published Aug 11, 2026 · Updated Aug 11, 2026

Improper input validation in iperf3 on Red Hat Enterprise Linux allows remote attackers to interrupt an exposed iperf3 server. The get_parameters() path accepts oversized parallel and len values from control-channel JSON, then CREATE_STREAMS and iperf_new_stream() turn them into excessive threads, streams, and buffer allocations. Network access to a listening server is sufficient when iperf authentication is disabled; repeated requests exhaust CPU and memory and keep the service unavailable.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in iperf3 on Red Hat Enterprise Linux allows remote attackers to interrupt an exposed iperf3 server. The get_parameters() path accepts oversized parallel and len values from control-channel JSON, then CREATE_STREAMS and iperf_new_stream() turn them into excessive threads, streams, and buffer allocations. Network access to a listening server is sufficient when iperf authentication is disabled; repeated requests exhaust CPU and memory and keep the service unavailable.

The record

CVE
CVE-2026-71217
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-20, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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