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CVE-2021-28041

📛 CVE Title

Arch Linux: Arbitrary code execution (CVE-2021-28041)

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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.

Overview

State
—
Assigner (CNA)
—
CVSS severity
MEDIUM
CVSS score
CVSS 5.0 / 10 5.0 5.0 / 10
CVSS vector
AV:N/AC:H/Au:S/C:P/I:P/A:P
Effective score
5.0 / 10 MEDIUM source: CNA overview
MSRC score
7.1 / 10 HIGH
CWE(s)
CWE-415
Reserved
—
Published
2021-03-05 00:00 UTC
Last updated
2026-02-26 01:01 UTC
Source
https://www.rapid7.com/db/vulnerabilities/arch-linux-cve-2021-28041/

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2021-03-05 21:15:13 UTC
NVD last modified
2026-06-17 03:45:46 UTC
NVD CVSS v3.1
CVSS 7.1 / 10 7.1 7.1 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore
1.2 / 10
Impact subscore
5.9 / 10
EPSS score
0.0342 (probability of exploitation in next 30 days)
EPSS percentile
87.41% vs all CVEs — higher = more likely to be exploited, as of 2026-06-29

NVD / KEV / EPSS data refreshed 2026-06-30 01:12 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2021-14748
Assigner
mitre
Published
Mar 5, 2021, 7:07:34 PM
Updated
Aug 3, 2024, 9:33:17 PM
EUVD-reported EPSS
3.4200
Vendors
n/a
Products
n/a (n/a)
Aliases
GHSA-gp5m-rxrx-pfrj

ENISA 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.

EUVD references (9)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-11 01:52 UTC (source: CVRF).

MS CVSS base score
7.1 / 10 (temporal 7.1)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Release
2021-Mar
Microsoft remediations / KB articles (2)
Microsoft FAQ (1)

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?

One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.

Affected products — CPE 2.3 (12) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:hci_storage_node_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:netapp:hci_storage_node:-:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:o:oracle:zfs_storage_appliance:8.8:*:*:*:*:*:*:*

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

MITRE references (7) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (10)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (18)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (4)

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Raw JSON

The full cvelistV5 record. Download as CVE-2021-28041.json.

Not stored.