CVE-2026-101283
Critical
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
SeverityCritical
CVSS9.2
Exploit probability—
ProductEsnet Iperf3
PublishedSep 30, 2026
First seenSep 30, 2026
Weakness typeCWE-122CWE-122
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| esnet iperf3 | 3.20, 3.21 | — |
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