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CRITICAL

iperf3 3.20–3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a 256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (guard warns only), so an unauthenticated client overflows the heap via an oversized authtoken; fixed in 3.22

Published Sep 30, 2026

Description

iperf3 3.20–3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a 256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (guard warns only), so an unauthenticated client overflows the heap via an oversized authtoken; fixed in 3.22

Affected products

Remediation

No remediation recorded yet.

Weaknesses (1)

References (1)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner Anthropic
Published Sep 30, 2026
Updated Oct 1, 2026
Reserved Sep 28, 2026
CISA Vulnrichment
Updated Oct 1, 2026
NVD
Status Received
Modified Sep 30, 2026
Red Hat
Severity n/a
Public date n/a