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    CVE-2026-101283

    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
    Last Modified:Oct 1, 2026
    EPS:Sep 30, 2026
    EPSS Score:0.00426
    CVSS Score:9.2

    Affected Products

    Vendor
    Es
    Product
    Iperf3

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    CVE-2025-54350 (CVSS 3.7) — In iperf before 3.19.1, iperf_auth.c has a Base64Decode assertion failure and application exit upon a malforme…
    CVE-2024-53580 (CVSS 7.5) — iperf v3.17.1 was discovered to contain a segmentation violation via the iperf_exchange_parameters() function.…
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    CVE-2023-7250 (CVSS 5.3) — A flaw was found in iperf, a utility for testing network performance using TCP, UDP, and SCTP. A malicious or …
    CVE-2023-38403 (CVSS 7.5) — iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.…
    CVE-2016-4303 (CVSS 9.8) — The parse_string function in cjson.c in the cJSON library mishandles UTF8/16 strings, which allows remote atta…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High