Home/CVE/ssh-agent in OpenSSH before 8.5 has a double free that may be relevant in a few less-common scenarios, such as unconstra
CVE

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 unconstra

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.

HIGH · CVSS 7.1 EPSS 0.00256
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-415Double Free
▤

Affected Products & Versions

9
openbsd openssh>= 8.2 and < 8.5
fedoraproject fedoraall versions
netapp cloud backupall versions
netapp hci management nodeall versions
netapp solidfireall versions
netapp hci compute node firmwareall versions
netapp hci storage node firmwareall versions
oracle communications offline mediation controllerall versions
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSuspicious OpenSSH Daemon Error
productmediumOpenSSH Server Listening On Socket
▣

Scoring & Timeline

7.1
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Mar 2021 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

8
suse-csafopenSUSE-SU-2024:13842-1
siemens-csafSSA-398330
suse-csafopenSUSE-SU-2021:4153-1
suse-csafSUSE-SU-2021:4153-1
usnUSN-4762-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568dbPatchThird Party Advisory
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/202105-35Third Party Advisory
https://security.netapp.com/advisory/ntap-20210416-0002/Third Party Advisory
https://www.openssh.com/security.htmlNot ApplicableVendor Advisory
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