CVE-2023-3347Samba: smb2 packet signing is not enforced when "server signing = required" is set
- 5.9MediumCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 62% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.
Timeline
ID reserved
By redhat
- 29 days later
· 29 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Modified | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.44% · top 62% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Affected products
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:4.17.5-3.el8_8 – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:4.17.5-3.el8_8 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:4.17.5-103.el9_2 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:4.17.5-103.el9_2 – < *
Red Hat · Red Hat Enterprise Linux 6
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 6
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 7
All versions: unaffected
All versions: unknown
References
References9
- RHSA-2023:4325 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2023:4328 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://access.redhat.com/security/cve/CVE-2023-3347 (opens in a new tab)vdb-entryx_refsource_REDHATx_transferred
- RHBZ#2222792 (opens in a new tab)issue-trackingx_refsource_REDHATx_transferred
- https://www.samba.org/samba/security/CVE-2023-3347.html (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/ (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20230731-0010/ (opens in a new tab)x_transferred
- https://www.debian.org/security/2023/dsa-5477 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-44015 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-3347)Record last updated .