CVE-2021-28041

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.

CVSS 3.1

7.1CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS

3.5% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-25)

CWE

CWE-415

Published

2021-03-05

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• fedoraproject:fedora
• netapp:cloud_backup
• netapp:hci_compute_node_firmware
• netapp:hci_management_node
• netapp:hci_storage_node_firmware
• netapp:solidfire
• openbsd:openssh
• oracle:communications_offline_mediation_controller
• oracle:zfs_storage_appliance

References

• 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/

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