A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users. Given this code is not in any released versions, no security releases have been issued.
総合評価: CVE-2023-3603 は低リスク（30.7/100）。CVSS 深刻度は低。悪用される可能性が高い（EPSS 0.77%、51 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
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 | 2026-06-15 | 0.12% | 0.77% | +0.65% |
| 2 | 2025-11-21 | 0.45% | 0.12% | -0.33% |
| 3 | 2025-11-18 | — | 0.45% | — |
EPSS の全履歴 （全 17 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 |
|---|---|---|---|---|---|---|
| 3.1 | 3.1 | LOW |
|
1.6 | 1.4 | [email protected] |
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-3603: 1 source package rows (libssh); 2 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 2. | https://security.alpinelinux.org/vuln/CVE-2023-3603 |
debian
|
unimportant | CVE-2023-3603 unimportant priority: Debian including 1 source packages (libssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2023-3603 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2023-3603 |
suse
|
medium | CVE-2023-3603 severity moderate: SUSE including 6 source package names (libssh, libssh-config, libssh-devel, libssh-devel-doc, libssh4, libssh4-32bit), 126 product×package rows across 34 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7, … (34 product lines)): Known Not Affected 126. | https://www.suse.com/security/cve/CVE-2023-3603/ |
ubuntu
|
medium | CVE-2023-3603 medium priority: Ubuntu including 1 source packages (libssh), 8 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 7, ignored 1. | https://ubuntu.com/security/CVE-2023-3603 |
| URL | タグ |
|---|---|
| https://access.redhat.com/security/cve/CVE-2023-3603 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2221791 | Issue Tracking Third Party Advisory |