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TI-2021-05961 Aliases CVE-2021-23192GHSA-vffc-r23p-p6rq

Improper input validation in samba

Priority LOW 37CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.

Why it matters now

EPSS 0.01953 80th percentileScored 2026-11-08
Fix Fixed Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—sambaAffects samba v4.10.0 to 4.15.1, Fixed in samba v4.15.2, v4.14.10 and v4.13.14.—No fix listedCNA
  • samba Vendor— Affected Affects samba v4.10.0 to 4.15.1, Fixed in samba v4.15.2, v4.14.10 and v4.13.14. Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*4.10.0 to before 4.13.14; 4.14.0 to before 4.14.10; 4.15.0 to before 4.15.2VulnerableSamba
  • cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.10.0 to before 4.13.14; 4.14.0 to before 4.14.10; 4.15.0 to before 4.15.2 Vulnerable ·Samba

Remediation

Red Hat 3 advisories

  • RHSA-2022:0008 Released 2022-01-04 · Red Hat rating Important
    samba security update
    • Red Hat Enterprise Linux BaseOS EUS (v.8.4) ctdb-4.13.3-8.el8_4, ctdb-tests-4.13.3-8.el8_4, libsmbclient-4.13.3-8.el8_4 +19
    • Red Hat Enterprise Linux CRB EUS (v.8.4) libsmbclient-devel-4.13.3-8.el8_4, libwbclient-devel-4.13.3-8.el8_4, samba-devel-4.13.3-8.el8_4
  • RHSA-2021:5082 Released 2021-12-13 · Red Hat rating Important
    samba security update
    • Red Hat CodeReady Linux Builder (v. 8) libsmbclient-devel-4.14.5-7.el8_5, libwbclient-devel-4.14.5-7.el8_5, samba-devel-4.14.5-7.el8_5
    • Red Hat Enterprise Linux AppStream (v. 8) samba-vfs-iouring-4.14.5-7.el8_5
    • Red Hat Enterprise Linux BaseOS (v. 8) ctdb-4.14.5-7.el8_5, libsmbclient-4.14.5-7.el8_5, libwbclient-4.14.5-7.el8_5 +18
  • RHSA-2021:4843 Released 2021-11-29 · Red Hat rating Important
    samba security update
    • Red Hat Gluster 3.5 Samba on RHEL-8 ctdb-4.14.5-204.el8rhgs, libsmbclient-4.14.5-204.el8rhgs, libsmbclient-devel-4.14.5-204.el8rhgs +18

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:5082
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:5082
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:5082
Red Hat Enterprise Linux BaseOS EUS (v.8.4)Fixed RHSA-2022:0008
Red Hat Enterprise Linux CRB EUS (v.8.4)Fixed RHSA-2022:0008
Red Hat Gluster 3.5 Samba on RHEL-8Fixed RHSA-2021:4843
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-23192
  2. 2026-10-03 Alias added: GHSA-vffc-r23p-p6rq

References

Patch 1

Advisory 3

  • TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-05139 Code injection in samba KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-00210 The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x… CVSS 2.0HIGH 10.0
  • TI-2003-00081 Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in… CVSS 2.0HIGH 10.0
  • TI-2003-00185 Buffer overflow in the call_trans2open function in trans2.c for Samba 2.2.x before… CVSS 2.0HIGH 10.0
  • TI-2007-02362 Multiple heap-based buffer overflows in the NDR parsing in smbd in Samba 3.0.0 through… CVSS 2.0HIGH 10.0
See all 215 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences