CVE-2026-101283

Pre-Authentication Heap Buffer Overflow in iperf3 RSA Decryption

Published Sep 30, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Es
Es iperf3
Vendors & Products Es
Es iperf3
Type Values Removed Values Added
Title Pre-Authentication Heap Buffer Overflow in iperf3 RSA Decryption
Type Values Removed Values Added
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
Weaknesses CWE-122
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Anthropic
Published
Updated
Oct 1, 2026, 3:51 PM
Reserved
Sep 28, 2026, 12:01 PM
Status
Awaiting Analysis
Published
Sep 30, 2026, 10:16 PM
Modified
Oct 1, 2026, 4:17 PM