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.
総合評価: CVE-2023-3347 は中リスク（44.5/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.42%、61 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2025-11-21 | 0.90% | 0.42% | -0.48% |
| 2 | 2025-11-18 | 0.42% | 0.90% | +0.48% |
| 3 | 2025-04-15 | — | 0.42% | — |
EPSS の全履歴 （全 8 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-3347: 1 source package rows (samba); 20 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 20. | https://security.alpinelinux.org/vuln/CVE-2023-3347 |
debian
|
unimportant | CVE-2023-3347 unimportant priority: Debian including 1 source packages (samba), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2023-3347 |
gentoo
|
high | CVE-2023-3347: 1 GLSA(s) (202402-28), 1 atom(s) (net-fs/samba); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-3347 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2023-3347 |
suse
|
medium | CVE-2023-3347 severity moderate: SUSE including 517 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 1761 product×package rows across 92 product lines (Image SLES15-SP5-Azure-3P, Image SLES15-SP5-Azure-Basic, … (92 product lines)): Known Not Affected 1245, Fixed 285, Known Affected 231. | https://www.suse.com/security/cve/CVE-2023-3347/ |
ubuntu
|
medium | CVE-2023-3347 medium priority: Ubuntu including 1 source packages (samba), 8 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 6, needs-triage 1, released 1. | https://ubuntu.com/security/CVE-2023-3347 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| samba | samba | >= 4.17.0, < 4.17.10 | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
| samba | samba | >= 4.18.0, < 4.18.5 | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
| redhat | storage | 3.0 | cpe:2.3:a:redhat:storage:3.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 8.0 | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 9.0 | cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 38 | cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* |