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Vulnerability details: VCID-9ecv-b248-qqc2
Vulnerability ID VCID-9ecv-b248-qqc2
Aliases CVE-2021-28041
Summary ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstrained agent-socket access on a legacy operating system, or the forwarding of an agent to an attacker-controlled host.
Status Published
Exploitability 0.5
Weighted Severity 6.4
Risk 3.2
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-416 Use After Free
CWE-415 Double Free
System Score Found at
cvssv3 7.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28041.json
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00191 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
epss 0.00275 https://api.first.org/data/v1/epss?cve=CVE-2021-28041
cvssv3.1 7.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.6 https://nvd.nist.gov/vuln/detail/CVE-2021-28041
cvssv3.1 7.1 https://nvd.nist.gov/vuln/detail/CVE-2021-28041
archlinux Medium https://security.archlinux.org/AVG-1657
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28041.json
https://api.first.org/data/v1/epss?cve=CVE-2021-28041
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28041
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQWGII3LQR4AOTPPFXGMTYE7UDEWIUKI/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXST2CML2MWY3PNVUXX7FFJE3ATJMNVZ/
https://security.gentoo.org/glsa/202105-35
https://security.netapp.com/advisory/ntap-20210416-0002/
https://www.openssh.com/txt/release-8.5
https://www.openwall.com/lists/oss-security/2021/03/03/1
https://www.oracle.com//security-alerts/cpujul2021.html
1935055 https://bugzilla.redhat.com/show_bug.cgi?id=1935055
984940 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984940
ASA-202103-6 https://security.archlinux.org/ASA-202103-6
AVG-1657 https://security.archlinux.org/AVG-1657
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:oracle:zfs_storage_appliance:8.8:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:oracle:zfs_storage_appliance:8.8:*:*:*:*:*:*:*
CVE-2021-28041 https://nvd.nist.gov/vuln/detail/CVE-2021-28041
USN-4762-1 https://usn.ubuntu.com/4762-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28041.json
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

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/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

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:H/Au:S/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-28041
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-28041
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

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.4153
EPSS Score 0.00191
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:24.401056+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.13/main.json 37.0.0