CVE catalog

CVE-2021-28041

openssh: CVE-2021-28041

Severity: High · CVSS 7.1CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Published: Mar 3, 2021, 11:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 3.51% · Oct 22, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	openssh	sid	`1:10.6p1-1`	fixed
Debian	openssh	forky	`1:10.6p1-1`	fixed
Debian	openssh	trixie	`1:10.0p1-7+deb13u4`	fixed
Debian	openssh	trixie-security	`1:10.0p1-7+deb13u2`	fixed
Debian	openssh	bookworm	`1:9.2p1-2+deb12u10`	fixed
Debian	openssh	bookworm-security	`1:9.2p1-2+deb12u9`	fixed
Cpe	openssh	Not reported	`8.5`	fixed
Cpe	fedora	Not reported	Not reported	unknown
Cpe	cloud_backup	Not reported	Not reported	unknown
Cpe	hci_management_node	Not reported	Not reported	unknown
Cpe	solidfire	Not reported	Not reported	unknown
Cpe	hci_compute_node_firmware	Not reported	Not reported	unknown
Cpe	hci_storage_node_firmware	Not reported	Not reported	unknown
Cpe	communications_offline_mediation_controller	Not reported	Not reported	unknown
Cpe	zfs_storage_appliance	Not reported	Not reported	unknown
Alpine	openssh	3.12	`8.3_p1-r2`	fixed
Alpine	openssh	3.13	`8.4_p1-r1`	fixed
Alpine	openssh	3.14	`8.5_p1-r0`	fixed
Alpine	openssh	3.15	`8.5_p1-r0`	fixed
Alpine	openssh	3.16	`8.5_p1-r0`	fixed
Alpine	openssh	3.17	`8.5_p1-r0`	fixed
Alpine	openssh	3.18	`8.5_p1-r0`	fixed
Alpine	openssh	3.19	`8.5_p1-r0`	fixed
Alpine	openssh	3.20	`8.5_p1-r0`	fixed
Alpine	openssh	3.21	`8.5_p1-r0`	fixed
Alpine	openssh	3.22	`8.5_p1-r0`	fixed
Alpine	openssh	3.23	`8.5_p1-r0`	fixed
Alpine	openssh	3.24	`8.5_p1-r0`	fixed
Ubuntu	openssh	20.04	`1:8.0p1-6build1`	vulnerable
Ubuntu	openssh	20.04	`1:8.1p1-1`	vulnerable
Ubuntu	openssh	20.04	`1:8.1p1-5`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4ubuntu0.1`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4ubuntu0.2`	fixed
Suse	openssh	linux enterprise module for basesystem 15 sp3	`8.4p1-3.9.1`	fixed
Suse	openssh-askpass-gnome	linux enterprise module for desktop applications 15 sp3	`8.4p1-3.9.1`	fixed
Suse	openssh	linux enterprise module for server applications 15 sp3	`8.4p1-3.9.1`	fixed
Suse	openssh	linux enterprise micro 5.1	`8.4p1-3.9.1`	fixed
Ubuntu	openssh	20.04	`1:8.0p1-6build1`	vulnerable
Ubuntu	openssh	20.04	`1:8.1p1-1`	vulnerable
Ubuntu	openssh	20.04	`1:8.1p1-5`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4ubuntu0.1`	vulnerable
Ubuntu	openssh	20.04	`1:8.2p1-4ubuntu0.2`	fixed
Opensuse	openssh	leap 15.3	`8.4p1-3.9.1`	fixed
Opensuse	openssh-askpass-gnome	leap 15.3	`8.4p1-3.9.1`	fixed
Opensuse	openssh	tumbleweed	`9.6p1-3.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openssh	source	sid	`1:8.4p1-5`	not yet assigned	Not reported	[984940]
Debian	openssh	source	forky	`1:8.4p1-5`	not yet assigned	Not reported	[984940]
Debian	openssh	source	trixie	`1:8.4p1-5`	not yet assigned	Not reported	[984940]
Debian	openssh	source	bookworm	`1:8.4p1-5`	not yet assigned	Not reported	[984940]
Cpe	openssh	cpe	Not reported	`8.5`	Not reported	NVD-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.12	`8.3_p1-r2`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.13	`8.4_p1-r1`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.14	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.15	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.16	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.17	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.18	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.19	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.20	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.21	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.22	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.23	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Alpine	openssh	apk	3.24	`8.5_p1-r0`	Not reported	ALPINE-CVE-2021-28041	Not reported
Ubuntu	openssh	deb	20.04	`1:8.2p1-4ubuntu0.2`	Not reported	USN-4762-1	Not reported
Suse	openssh	rpm	linux enterprise module for basesystem 15 sp3	`8.4p1-3.9.1`	Not reported	SUSE-SU-2021:4153-1	Not reported
Suse	openssh-askpass-gnome	rpm	linux enterprise module for desktop applications 15 sp3	`8.4p1-3.9.1`	Not reported	SUSE-SU-2021:4153-1	Not reported
Suse	openssh	rpm	linux enterprise module for server applications 15 sp3	`8.4p1-3.9.1`	Not reported	SUSE-SU-2021:4153-1	Not reported
Suse	openssh	rpm	linux enterprise micro 5.1	`8.4p1-3.9.1`	Not reported	SUSE-SU-2021:4153-1	Not reported
Ubuntu	openssh	deb	20.04	`1:8.2p1-4ubuntu0.2`	Not reported	UBUNTU-CVE-2021-28041	Not reported
Opensuse	openssh	rpm	leap 15.3	`8.4p1-3.9.1`	Not reported	OPENSUSE-SU-2021:4153-1	Not reported
Opensuse	openssh-askpass-gnome	rpm	leap 15.3	`8.4p1-3.9.1`	Not reported	OPENSUSE-SU-2021:4153-1	Not reported
Opensuse	openssh	rpm	tumbleweed	`9.6p1-3.1`	Not reported	OPENSUSE-SU-2024:13842-1	Not reported

[Debian bug #984940]

OpenFactory catalog packages

[openSUSE Tumbleweed]

[openssh-cavs]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh-clients]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh-common]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh-helpers]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh-server]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh-server-config-rootlogin]Unknown
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.6p1-3.1
  Version impact unknown
  dsa · openssh · opensuse · tumbleweed
[openssh]Fixed
Source package: [openssh]
Details (1)
- 10.5p1-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 9.6p1-3.1
  dsa · openssh · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[openssh-client]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[openssh-client-gssapi]Fixed
Source package: [openssh]
Details (2)
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[openssh-server]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[openssh-server-gssapi]Fixed
Source package: [openssh]
Details (2)
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[openssh-sftp-server]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[openssh-tests]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[ssh]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · all · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · all · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · all · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · all · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · all · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · all · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
[ssh-askpass-gnome]Fixed
Source package: [openssh]
Details (8)
- 1:9.2p1-2+deb12u10 · amd64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u10 · arm64 · bookworm
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:10.0p1-7~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · amd64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u9 · arm64 · bookworm-security
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · amd64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm
- 1:9.2p1-2+deb12u7 · arm64 · bookworm-updates
  Fixed · Fixed: 1:8.4p1-5
  dsa · openssh · debian · bookworm

Observed: Oct 23, 2026, 5:55:28 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]