CVE-2021-28041
HIGHCVSS 7.1/10EPSS 3.42%
Last modified
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/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
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://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://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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28041?
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