CVE-2021-28041

Name: CVE-2021-28041
Creator: NVD / NIST
Published: 2021-03-05T21:15:13.2+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 3.42%

Last modified Jun 17, 2026

CVE-2021-28041 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 3.42% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

3.42%

87.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	>= 8.2, < 8.5
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Netapp	Cloud Backup	All versions
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Hci Compute Node Firmware	All versions
Netapp	Hci Storage Node Firmware	All versions
Oracle	Communications Offline Mediation Controller	12.0.0.3.0
Oracle	Zfs Storage Appliance	8.8

References

https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568dbPatch, Third 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 Applicable, Vendor Advisory
https://www.openssh.com/txt/release-8.5Release Notes, Vendor Advisory
https://www.openwall.com/lists/oss-security/2021/03/03/1Mailing List, Patch, Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568dbPatch, Third 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 Applicable, Vendor Advisory
https://www.openssh.com/txt/release-8.5Release Notes, Vendor Advisory
https://www.openwall.com/lists/oss-security/2021/03/03/1Mailing List, Patch, Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory

Timeline

Published: Mar 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28041?

How severe is CVE-2021-28041?

CVE-2021-28041 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 3.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28041?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28041?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST