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Vulnerability details: VCID-4rha-xvqa-qbh9
Vulnerability ID VCID-4rha-xvqa-qbh9
Aliases CVE-2021-43565
GHSA-gwc9-m7rh-j2ww
Summary x/crypto/ssh vulnerable to panic via malformed packets The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an unauthenticated attacker to panic an SSH server. When using AES-GCM or ChaCha20Poly1305, consuming a malformed packet which contains an empty plaintext causes a panic.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-20 Improper Input Validation
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43565.json
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
epss 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2021-43565
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 7.5 https://go.dev/cl/368814
generic_textual HIGH https://go.dev/cl/368814
cvssv3.1 7.5 https://go.dev/issues/49932
generic_textual HIGH https://go.dev/issues/49932
cvssv3.1 7.5 https://groups.google.com/forum/#!forum/golang-announce
generic_textual HIGH https://groups.google.com/forum/#!forum/golang-announce
cvssv3.1 7.5 https://groups.google.com/g/golang-announce/c/2AR1sKiM-Qs
generic_textual HIGH https://groups.google.com/g/golang-announce/c/2AR1sKiM-Qs
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43565
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-43565
cvssv3.1 7.5 https://pkg.go.dev/vuln/GO-2022-0968
generic_textual HIGH https://pkg.go.dev/vuln/GO-2022-0968
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43565.json
https://api.first.org/data/v1/epss?cve=CVE-2021-43565
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43565
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://go.dev/cl/368814
https://go.dev/issues/49932
https://groups.google.com/forum/#%21forum/golang-announce
https://groups.google.com/forum/#!forum/golang-announce
https://groups.google.com/g/golang-announce/c/2AR1sKiM-Qs
https://nvd.nist.gov/vuln/detail/CVE-2021-43565
https://pkg.go.dev/vuln/GO-2022-0968
2030787 https://bugzilla.redhat.com/show_bug.cgi?id=2030787
cpe:2.3:a:golang:ssh:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:golang:ssh:*:*:*:*:*:*:*:*
RHSA-2022:0595 https://access.redhat.com/errata/RHSA-2022:0595
RHSA-2022:0735 https://access.redhat.com/errata/RHSA-2022:0735
RHSA-2022:1081 https://access.redhat.com/errata/RHSA-2022:1081
RHSA-2022:1276 https://access.redhat.com/errata/RHSA-2022:1276
RHSA-2022:1361 https://access.redhat.com/errata/RHSA-2022:1361
RHSA-2022:1372 https://access.redhat.com/errata/RHSA-2022:1372
RHSA-2022:1476 https://access.redhat.com/errata/RHSA-2022:1476
RHSA-2022:1681 https://access.redhat.com/errata/RHSA-2022:1681
RHSA-2022:4956 https://access.redhat.com/errata/RHSA-2022:4956
RHSA-2022:5068 https://access.redhat.com/errata/RHSA-2022:5068
RHSA-2022:5069 https://access.redhat.com/errata/RHSA-2022:5069
RHSA-2022:5188 https://access.redhat.com/errata/RHSA-2022:5188
RHSA-2022:5201 https://access.redhat.com/errata/RHSA-2022:5201
RHSA-2022:5673 https://access.redhat.com/errata/RHSA-2022:5673
RHSA-2022:8938 https://access.redhat.com/errata/RHSA-2022:8938
RHSA-2024:2944 https://access.redhat.com/errata/RHSA-2024:2944
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43565.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://go.dev/cl/368814
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://go.dev/issues/49932
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://groups.google.com/forum/#!forum/golang-announce
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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required

unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://groups.google.com/g/golang-announce/c/2AR1sKiM-Qs
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

low

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43565
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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required

unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://pkg.go.dev/vuln/GO-2022-0968
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

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low

none

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low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.01276
EPSS Score 0.00013
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:00:00.863355+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/09/GHSA-gwc9-m7rh-j2ww/GHSA-gwc9-m7rh-j2ww.json 37.0.0