An issue was discovered in Mbed TLS 3.x before 3.6.1. With TLS 1.3, when a server enables optional authentication of the client, if the client-provided certificate does not have appropriate values in if keyUsage or extKeyUsage extensions, then the return value of mbedtls_ssl_get_verify_result() would incorrectly have the MBEDTLS_X509_BADCERT_KEY_USAGE and MBEDTLS_X509_BADCERT_KEY_USAGE bits clear. As a result, an attacker that had a certificate valid for uses other than TLS client authentication would nonetheless be able to use it for TLS client authentication. Only TLS 1.3 servers were affected, and only with optional authentication (with required authentication, the handshake would be aborted with a fatal alert).
総合評価: CVE-2024-45159 は中リスク（49.6/100）。CVSS 深刻度は重大。悪用される可能性が高い（EPSS 0.39%、30 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 | 2026-06-15 | 0.60% | 0.39% | -0.21% |
| 2 | 2026-01-25 | 0.44% | 0.60% | +0.16% |
| 3 | 2025-11-21 | — | 0.44% | — |
EPSS の全履歴 （全 13 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 |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2024-45159: 1 source package rows (mbedtls); 4 state rows across 4 repos (3.20-main, 3.21-main, 3.22-main, edge-main); fixed 4, open 0. | https://security.alpinelinux.org/vuln/CVE-2024-45159 |
debian
|
unimportant | CVE-2024-45159 unimportant priority: Debian including 1 source packages (mbedtls), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2024-45159 |
ubuntu
|
medium | CVE-2024-45159 medium priority: Ubuntu including 1 source packages (mbedtls), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): not-affected 7, ignored 1, released 1. | https://ubuntu.com/security/CVE-2024-45159 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| trustedfirmware | mbed_tls | >= 3.2.0, < 3.6.1 | cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://github.com/Mbed-TLS/mbedtls/releases/ | Release Notes |
| https://mbed-tls.readthedocs.io/en/latest/security-advisories/ | Issue Tracking |
| https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2024-08-3/ | Vendor Advisory |