{"id":"CVE-2026-71217","aliases":["ALSA-2026:61257","ALSA-2026:61389","ALSA-2026:61680","AZL-95601","BELL-CVE-2026-71217","CLSA-2026-1788532080","CLSA-2026-1788821988","DEBIAN-CVE-2026-71217","EUVD-2026-55990","GHSA-4jvc-h3x3-w6qj","MGASA-2026-0539","OESA-2026-3527","RHSA-2026:61257","RHSA-2026:61389","RHSA-2026:61680","RLSA-2026:61257","RLSA-2026:61389","RLSA-2026:61680","SUSE-SU-2026:24178-1","SUSE-SU-2026:24234-1","SUSE-SU-2026:4678-1","UBUNTU-CVE-2026-71217","openSUSE-SU-2026:12060-1","openSUSE-SU-2026:22090-1"],"status":"published","title":"Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00635,"percentile":0.50893,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-20"],"published":"2026-08-11T08:50:10Z","modified":"2026-11-06T01:04:15Z","exploits":[{"source":"pocgithub","id":"Reelix/CVE-2026-71217-PoC","title":"Reelix/CVE-2026-71217-PoC","date":"2026-09-20","url":"https://github.com/Reelix/CVE-2026-71217-PoC"}],"fixes":[{"ecosystem":"AlmaLinux:8","package":"iperf3","fixed_in":["3.5-12.el8_10.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"iperf3","fixed_in":["3.9-17.el9_8.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:10","package":"iperf3","fixed_in":["3.17.1-6.el10_2.1"],"sources":["osv"]},{"ecosystem":"Azure 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A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T09:32:35Z","modified":"2026-08-31T18:32:19Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:11:11.962153Z"}],"nvd":[{"id":"CVE-2026-71217","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T09:17:14.057Z","modified":"2026-11-05T00:17:24.82Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-05T01:45:10.513148Z"}],"osv":[{"id":"BELL-CVE-2026-71217","status":"published","published":"2026-08-12T06:04:25.706093Z","modified":"2026-11-03T07:15:17.301017956Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T07:52:02.098855Z"},{"id":"CVE-2026-71217","title":"Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T08:50:10.14Z","modified":"2026-11-06T01:04:15.493637164Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-06T01:32:47.895286Z"},{"id":"DEBIAN-CVE-2026-71217","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T09:17:14.057Z","modified":"2026-11-05T09:47:30.384222963Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-05T13:31:24.64316Z"},{"id":"OESA-2026-3527","title":"iperf3 security update","description":"Iperf is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, protocols, and buffers.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.(CVE-2026-71217)","status":"published","published":"2026-08-30T04:14:54Z","modified":"2026-08-30T04:32:42.200908218Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.217107Z"},{"id":"RHSA-2026:61257","title":"Red Hat Security Advisory: iperf3 security update","status":"published","published":"2026-08-31T10:12:13Z","modified":"2026-09-01T10:28:12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"RHSA-2026:61389","title":"Red Hat Security Advisory: iperf3 security update","status":"published","published":"2026-09-01T10:28:26Z","modified":"2026-09-01T10:47:46.917222959Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"RHSA-2026:61680","title":"Red Hat Security Advisory: iperf3 security update","status":"published","published":"2026-09-01T10:28:34Z","modified":"2026-09-01T10:47:50.182828092Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"RLSA-2026:61257","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.\n\nSecurity Fix(es):\n\n* iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-08-31T12:01:50.242555Z","modified":"2026-08-31T12:30:02.700700176Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"RLSA-2026:61389","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.\n\nSecurity Fix(es):\n\n* iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-09-01T06:05:08.552377Z","modified":"2026-09-01T06:30:02.764967702Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"RLSA-2026:61680","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.\n\nSecurity Fix(es):\n\n* iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-09-01T12:09:07.14364Z","modified":"2026-09-01T12:30:02.531444149Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:26.449929Z"},{"id":"UBUNTU-CVE-2026-71217","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T09:17:00Z","modified":"2026-10-17T13:00:45.113887419Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:03.035847Z"},{"id":"ALSA-2026:61257","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.  \n\nSecurity Fix(es):  \n\n  * iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-08-31T00:00:00Z","modified":"2026-10-29T11:02:29.114275497Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"ALSA-2026:61389","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.  \n\nSecurity Fix(es):  \n\n  * iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-08-31T00:00:00Z","modified":"2026-10-29T11:32:08.034446251Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"ALSA-2026:61680","title":"Important: iperf3 security update","description":"Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss.  \n\nSecurity Fix(es):  \n\n  * iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-08-31T00:00:00Z","modified":"2026-10-29T11:30:48.636530533Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"AZL-95601","title":"CVE-2026-71217 affecting package iperf3 for versions less than 3.17.1-5","description":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","status":"published","published":"2026-08-11T09:17:14Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.077208Z"},{"id":"CLSA-2026-1788532080","title":"iperf3: Fix of CVE-2026-71217","description":"- CVE-2026-71217: fix missing JSON value range checks in get_parameters() that\n  allowed out-of-range and invalid test parameters from the client","status":"published","published":"2026-09-04T14:28:10Z","modified":"2026-10-26T09:30:44.596059129Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1788821988","title":"iperf3: Fix of CVE-2026-71217","description":"- CVE-2026-71217: add JSON value checks for get_parameters to prevent resource\n  exhaustion from oversized control-channel parameters","status":"published","published":"2026-09-07T22:59:57Z","modified":"2026-10-26T09:31:31.667666055Z","updated_at":"2026-11-02T15:43:47.938828Z"},{"id":"MGASA-2026-0539","title":"Updated iperf package fixes security vulnerabilities","description":"Iperf3 server accepts unbounded peer-controlled json parameters enabling\nremote denial of service via resource exhaustion. (CVE-2026-71217)\nUnbounded peer-controlled allocation in iperf3 json_read() allows\nunauthenticated remote memory exhaustion. (CVE-2026-71218)\nIperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap\nuse-after-free: the server's per-test watchdog server_timer_proc() frees\nstreams without cancelling/joining their worker threads, so a blocked\nworker dereferences a freed iperf_stream. (CVE-2026-101276)\nIperf3 3.20–3.21 (esnet/iperf) has a pre-auth heap buffer overflow in\ndecrypt_rsa_message(): a 256-byte RSA buffer is BIO_read with the\nattacker-controlled ciphertext length (guard warns only), so an\nunauthenticated client overflows the heap via an oversized authtoken.\n(CVE-2026-101283)\nIperf3 \u003c 3.22 UDP Receive Worker Infinite Loop DoS. (CVE-2026-102253)\n","status":"published","published":"2026-10-25T01:13:22Z","modified":"2026-10-25T01:28:09.754940198Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:12060-1","title":"iperf-3.22-1.1 on GA media","description":"These are all security issues fixed in the iperf-3.22-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-05T00:00:00Z","modified":"2026-10-06T17:23:10.884795572Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22090-1","title":"Security update for iperf","description":"This update for iperf fixes the following issues:\n\n- CVE-2026-71217: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via\n  resource exhaustion (bsc#1284405).\n- CVE-2026-71218: unbounded peer-controlled allocation in JSON_read() allows unauthenticated remote memory exhaustion\n  (bsc#1284404).\n- CVE-2026-101276: iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-\n  test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads (bsc#1283786).\n- CVE-2026-101283: iperf3 3.20--3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a\n  256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (bsc#1283787).\n- CVE-2026-102253: missing checks in the server's UDP receive worker allows unauthenticated remote attackers to cause an\n  infinite loop (bsc#1283528).\n\nChanges for iperf:\n\n- Updated to version 3.22\n","status":"published","published":"2026-10-12T12:12:10Z","modified":"2026-10-19T17:23:13.585480674Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:24178-1","title":"Security update for iperf","description":"This update for iperf fixes the following issues:\n\n- CVE-2026-71217: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via\n  resource exhaustion (bsc#1284405).\n- CVE-2026-71218: unbounded peer-controlled allocation in JSON_read() allows unauthenticated remote memory exhaustion\n  (bsc#1284404).\n- CVE-2026-101276: iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-\n  test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads (bsc#1283786).\n- CVE-2026-101283: iperf3 3.20--3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a\n  256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (bsc#1283787).\n- CVE-2026-102253: missing checks in the server's UDP receive worker allows unauthenticated remote attackers to cause an\n  infinite loop (bsc#1283528).\n\nChanges for iperf:\n\n- Updated to version 3.22\n","status":"published","published":"2026-10-12T12:14:05Z","modified":"2026-10-20T17:23:58.074616255Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24234-1","title":"Security update for iperf","description":"This update for iperf fixes the following issues:\n\n- CVE-2026-71217: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via\n  resource exhaustion (bsc#1284405).\n- CVE-2026-71218: unbounded peer-controlled allocation in JSON_read() allows unauthenticated remote memory exhaustion\n  (bsc#1284404).\n- CVE-2026-101276: iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-\n  test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads (bsc#1283786).\n- CVE-2026-101283: iperf3 3.20--3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a\n  256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (bsc#1283787).\n- CVE-2026-102253: missing checks in the server's UDP receive worker allows unauthenticated remote attackers to cause an\n  infinite loop (bsc#1283528).\n\nChanges for iperf:\n\n- Updated to version 3.22\n","status":"published","published":"2026-10-12T12:09:00Z","modified":"2026-10-21T17:23:11.546296457Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:4678-1","title":"Security update for iperf","description":"This update for iperf fixes the following issues:\n\n- CVE-2026-71217: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via\n  resource exhaustion (bsc#1284405).\n- CVE-2026-71218: unbounded peer-controlled allocation in JSON_read() allows unauthenticated remote memory exhaustion\n  (bsc#1284404).\n- CVE-2026-101276: iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-\n  test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads (bsc#1283786).\n- CVE-2026-101283: iperf3 3.20--3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a\n  256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (bsc#1283787).\n- CVE-2026-102253: missing checks in the server's UDP receive worker allows unauthenticated remote attackers to cause an\n  infinite loop (bsc#1283528).\n\nChanges for iperf:\n\n- Updated to version 3.22.\n","status":"published","published":"2026-10-15T07:27:34Z","modified":"2026-10-15T18:00:06.423872963Z","updated_at":"2026-11-02T15:54:05.838224Z"}]}}