CVE-2021-28041

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-28041
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-05 21:15:13 UTC
Updated2026-10-14 12:17:10 UTC
Descriptionssh-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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

Problem Types: CWE-415 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
2.0[email protected]Primary4.6AV:N/AC:H/Au:S/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
High
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:H/Au:S/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Application Netapp Cloud Backup - All All All
Hardware Netapp Hci Compute Node - All All All
Operating System Netapp Hci Compute Node Firmware - All All All
Application Netapp Hci Management Node - All All All
Hardware Netapp Hci Storage Node - All All All
Operating System Netapp Hci Storage Node Firmware - All All All
Application Netapp Solidfire - All All All
Application Openbsd Openssh All All All All
Application Oracle Communications Offline Mediation Controller 12.0.0.3.0 All All All
Operating System Oracle Zfs Storage Appliance 8.8 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
CVE-2021-28041 OpenSSH Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Oracle Critical Patch Update Advisory - July 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
www.openssh.com/txt/release-8.5 af854a3a-2127-422b-91ae-364da2661108 www.openssh.com Release Notes, Vendor Advisory
OpenSSH: Multiple vulnerabilities (GLSA 202105-35) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
OpenSSH: Security af854a3a-2127-422b-91ae-364da2661108 www.openssh.com Not Applicable, Vendor Advisory
oss-security - Announce: OpenSSH 8.5 released af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
[SECURITY] Fedora 33 Update: openssh-8.4p1-7.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
upstream: factor SSH_AGENT_CONSTRAIN_EXTENSION parsing into its own · openssh/openssh-portable@e04fd6d · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
[SECURITY] Fedora 34 Update: openssh-8.5p1-2.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
FEDORA:FEDORA-2021-1d3698089d MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: openssh-8.5p1-2.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 180077 Debian Security Update for openssh (CVE-2021-28041)
  • 198291 Ubuntu Security Notification for Openssh Vulnerability (USN-4762-1)
  • 281545 Fedora Security Update for kde (FEDORA-2021-f68a5a75ba)
  • 281663 Fedora Security Update for openssh (FEDORA-2021-1d3698089d)
  • 296067 Oracle Solaris 11.4 Support Repository Update (SRU) 33.94.0 Missing (CPUAPR2021)
  • 38867 OpenSSH Double Free Vulnerability
  • 500489 Alpine Linux Security Update for openssh
  • 501464 Alpine Linux Security Update for openssh
  • 501760 Alpine Linux Security Update for openssh
  • 504248 Alpine Linux Security Update for openssh
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670370 EulerOS Security Update for openssh (EulerOS-SA-2021-1955)
  • 670391 EulerOS Security Update for openssh (EulerOS-SA-2021-1934)
  • 690164 Free Berkeley Software Distribution (FreeBSD) Security Update for openssh (76b5068c-8436-11eb-9469-080027f515ea)
  • 710079 Gentoo Linux OpenSSH Multiple vulnerabilities (GLSA 202105-35)
  • 751544 OpenSUSE Security Update for openssh (openSUSE-SU-2021:4153-1)
  • 900031 CBL-Mariner Linux Security Update for openssh 8.0p1
  • 902885 Common Base Linux Mariner (CBL-Mariner) Security Update for openssh (3925)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report