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Vulnerabilities

Vulnerability · 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…

Published Mar 5, 2021 · catalog updated Oct 14, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2021-28041. EPSS is 3.51%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.51%
Remediation
Advisory link
Affected products
cpe fedoraproject/fedora · cpe netapp/cloud backup · cpe netapp/hci compute node firmware · cpe netapp/hci management node · cpe netapp/hci storage node firmware · cpe netapp/solidfire

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fedoraproject/fedora33
  • cpe fedoraproject/fedora34
  • cpe netapp/cloud backupversion unspecified
  • cpe netapp/hci compute node firmwareversion unspecified
  • cpe netapp/hci management nodeversion unspecified
  • cpe netapp/hci storage node firmwareversion unspecified
  • cpe netapp/solidfireversion unspecified
  • cpe openbsd/opensshversion unspecified
  • cpe oracle/communications offline mediation controller12.0.0.3.0

How to fix CVE-2021-28041

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-28041. EPSS is 3.51%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with oracle/communications offline mediation controller 12.0.0.3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-415: Double Free. EPSS 3.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 5, 2021 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2021-28041

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-28041

    30-day exploitation probability 3.5%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.