{"id":"CVE-2021-29923","aliases":["ALPINE-CVE-2021-29923","AZL-79056","AZL-98910","BELL-CVE-2021-29923","BIT-golang-2021-29923","DEBIAN-CVE-2021-29923","EUVD-2021-16397","GHSA-38h6-vxp4-qxvm","OESA-2021-1402","RHSA-2021:3431","RHSA-2021:3585","RHSA-2021:4722","RHSA-2021:4910","RHSA-2022:0237","RHSA-2022:0260","RHSA-2022:0432","RHSA-2022:0557","RHSA-2022:0988","RHSA-2022:0989","RHSA-2022:0997","RHSA-2022:0998","RHSA-2022:1276","RLSA-2021:3585","UBUNTU-CVE-2021-29923"],"status":"published","title":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP...","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. 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net.ParseCIDR.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.03744,"percentile":0.90014,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-08-07T16:38:59Z","modified":"2026-11-03T06:32:28Z","fixes":[{"ecosystem":"Alpine:v3.15","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"golang","fixed_in":["1.17.0"],"sources":["osv"]},{"ecosystem":"Red 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advisory"]},{"url":"https://github.com/axios/axios/commit/5b457116e31db0e88fede6c428e969e87f290929","tags":["article"]},{"url":"https://huntr.dev/bounties/1e8f07fc-c384-4ff9-8498-0690de2e8c31","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-29482","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29482","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29482","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43565","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43565","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43565","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43824","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43824","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43824","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43825","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43825","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43825","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43826","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43826","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43826","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-21654","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-21654","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21654","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-5j4x-g36v-m283","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-21655","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-21655","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21655","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-7r5p-7fmh-jxpg","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-23606","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-23606","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23606","tags":["advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-9vp2-4cp7-vvxf","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-23635","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-23635","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23635","tags":["advisory"]},{"url":"https://istio.io/latest/news/security/istio-security-2022-003","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-24726","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-24726","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-24726","tags":["advisory"]},{"url":"https://istio.io/latest/news/security/istio-security-2022-004/","tags":["article"]},{"url":"https://errata.rockylinux.org/RLSA-2021:3585","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-29923","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T16:38:59Z","modified":"2024-08-03T22:18:03.455Z","updated_at":"2026-11-02T14:33:06.658806Z"}],"euvd":[{"id":"EUVD-2021-16397","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T16:38:59Z","modified":"2024-08-03T22:18:03Z","updated_at":"2026-11-03T03:24:43.413555Z"}],"ghsa":[{"id":"GHSA-38h6-vxp4-qxvm","title":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP...","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2022-05-24T19:10:21Z","modified":"2023-01-27T05:03:40Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T14:42:17.713098Z"}],"nvd":[{"id":"CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07.067Z","modified":"2026-06-17T03:48:27.323Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:56.562207Z"}],"osv":[{"id":"ALPINE-CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07.067Z","modified":"2026-11-03T06:32:28.433034754Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T07:17:41.158523Z"},{"id":"AZL-79056","title":"CVE-2021-29923 affecting package golang 1.25.7-1","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07Z","modified":"2026-04-21T04:34:36.643112Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:10.017343Z"},{"id":"AZL-98910","title":"CVE-2021-29923 affecting package golang 1.27.1-1","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07Z","modified":"2026-09-16T06:39:01Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:12.596039Z"},{"id":"BELL-CVE-2021-29923","title":"CVE-2021-29923 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:04.233379Z","modified":"2026-01-26T09:46:33.07038Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07.067Z","modified":"2026-10-20T10:54:38.916834638Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:19.483607Z"},{"id":"DEBIAN-CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:07.067Z","modified":"2026-08-27T23:04:01.123186829Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:34.94143Z"},{"id":"OESA-2021-1402","title":"golang security update","description":"The go programming language\r\n\r\nSecurity Fix(es):\r\n\r\nGo before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.(CVE-2021-33195)\n\nIn archive/zip in Go before 1.15.13 and 1.16.x before 1.16.5, a crafted file count (in an archive s header) can cause a NewReader or OpenReader panic.(CVE-2021-33196)\n\nIn Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.(CVE-2021-33197)\n\nIn Go before 1.15.13 and 1.16.x before 1.16.5, there can be a panic for a large exponent to the math/big.Rat SetString or UnmarshalText method.(CVE-2021-33198)\n\nThe crypto/tls package of Go through 1.16.5 does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.(CVE-2021-34558)\n\nGo before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.(CVE-2021-29923)\n\nGo before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function invocation from a WASM module, when GOARCH=wasm GOOS=js is used.(CVE-2021-38297)\n\nGo before 1.15.15 and 1.16.x before 1.16.7 has a race condition that can lead to a net/http/httputil ReverseProxy panic upon an ErrAbortHandler abort.(CVE-2021-36221)","status":"published","published":"2021-10-27T11:04:40Z","modified":"2026-08-18T01:16:06.608548299Z","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":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:3431","title":"Red Hat Security Advisory: go-toolset-1.15-golang security update","status":"published","published":"2024-09-30T14:18:26Z","modified":"2026-08-05T10:09:17Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:3585","title":"Red Hat Security Advisory: go-toolset:rhel8 security update","status":"published","published":"2024-10-21T18:01:45Z","modified":"2026-06-30T10:01:44Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:4722","title":"Red Hat Security Advisory: OpenShift Virtualization 2.6.8 RPMs security and bug fix update","status":"published","published":"2024-09-30T14:18:15Z","modified":"2026-06-30T10:01:46Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:4910","title":"Red Hat Security Advisory: OpenShift Virtualization 4.8.3 RPMs security and bug fix update","status":"published","published":"2024-09-30T14:18:03Z","modified":"2026-06-30T10:01:47Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0237","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (etcd) security update","status":"published","published":"2024-09-30T14:19:03Z","modified":"2026-06-30T10:01:49Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0260","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.1 (etcd) security update","status":"published","published":"2024-09-30T14:19:21Z","modified":"2026-06-30T10:01:50Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0432","title":"Red Hat Security Advisory: Release of OpenShift Serverless Client kn 1.20.0","status":"published","published":"2024-09-30T14:19:47Z","modified":"2026-10-13T10:02:51Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0557","title":"Red Hat Security Advisory: OpenShift Container Platform 4.9.22 security update","status":"published","published":"2024-09-30T14:19:15Z","modified":"2026-08-15T10:01:53Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0988","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.1 (golang-github-vbatts-tar-split) security update","status":"published","published":"2024-09-30T14:20:03Z","modified":"2026-06-30T10:01:52Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0989","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.1 (golang-qpid-apache) security update","status":"published","published":"2024-09-30T14:20:11Z","modified":"2026-06-30T10:01:53Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0997","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (golang-qpid-apache) security update","status":"published","published":"2024-09-30T14:19:55Z","modified":"2026-06-30T10:01:54Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:0998","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (golang-github-vbatts-tar-split) security update","status":"published","published":"2024-09-30T14:19:46Z","modified":"2026-06-30T10:01:54Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:1276","title":"Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.9 security update","status":"published","published":"2024-09-30T14:20:27Z","modified":"2026-10-17T10:01:26Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RLSA-2021:3585","title":"Moderate: go-toolset:rhel8 security update","description":"Go Toolset provides the Go programming language tools and libraries. Go is alternatively known as golang. \n\nSecurity Fix(es):\n\n* golang: net: incorrect parsing of extraneous zero characters at the beginning of an IP address octet (CVE-2021-29923)\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":"2021-09-21T07:12:48Z","modified":"2026-02-04T09:45:06.970287Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2021-08-07T17:15:00Z","modified":"2025-10-24T04:50:16Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"BIT-golang-2021-29923","description":"Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.","status":"published","published":"2024-03-06T11:06:07.577Z","modified":"2026-09-08T08:47:47.651258861Z","updated_at":"2026-11-02T15:28:30.70064Z"}]}}