CVE-2021-28041ssh-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…
Updated under an hour ago ()
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 11 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
openbsd openssh openbsd:openssh | from 8.2 before 8.5 | NVD |
fedoraproject fedora fedoraproject:fedora | 33; 34 | NVD |
netapp cloud_backup netapp:cloud_backup | all versions | NVD |
netapp hci_management_node netapp:hci_management_node | all versions | NVD |
netapp solidfire netapp:solidfire | all versions | NVD |
netapp hci_compute_node_firmware netapp:hci_compute_node_firmware | all versions | NVD |
netapp hci_storage_node_firmware netapp:hci_storage_node_firmware | all versions | NVD |
oracle communications_offline_mediation_controller oracle:communications_offline_mediation_controller | 12.0.0.3.0 | NVD |
oracle zfs_storage_appliance oracle:zfs_storage_appliance | 8.8 | NVD |
References
- https://www.openssh.com/security.htmlx-refsource-misc, not-applicable, vendor-advisory
- https://www.openwall.com/lists/oss-security/2021/03/03/1x-refsource-misc, mailing-list, patch, third-party-advisory
- https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568dbx-refsource-misc, patch, third-party-advisory
- https://www.openssh.com/txt/release-8.5x-refsource-misc, release-notes, vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXST2CML2MWY3PNVUXX7FFJE3ATJMNVZ/vendor-advisory, x-refsource-fedora
- https://security.gentoo.org/glsa/202105-35vendor-advisory, x-refsource-gentoo, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQWGII3LQR4AOTPPFXGMTYE7UDEWIUKI/vendor-advisory, x-refsource-fedora
- https://www.oracle.com//security-alerts/cpujul2021.htmlx-refsource-misc, third-party-advisory
- https://security.netapp.com/advisory/ntap-20210416-0002/x-refsource-confirm, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.