An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
総合評価: CVE-2020-24659 は悪用リスクが高い（76/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 3.73%、88 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
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。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 3.63% | 3.73% | +0.10% |
| 2 | 2026-02-28 | 3.40% | 3.63% | +0.24% |
| 3 | 2025-12-28 | — | 3.40% | — |
EPSS の全履歴 （全 25 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
high | CVE-2020-24659: 1 source package rows (gnutls); 30 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 20. | https://security.alpinelinux.org/vuln/CVE-2020-24659 |
debian
|
not yet assigned | CVE-2020-24659 not yet assigned priority: Debian including 1 source packages (gnutls28), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-24659 |
gentoo
|
low | CVE-2020-24659: 1 GLSA(s) (202009-01), 1 atom(s) (net-libs/gnutls); latest impact low. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-24659 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2020-24659 |
suse
|
medium | CVE-2020-24659 severity moderate: SUSE including 398 source package names (0.1.0:libgnutls30-3.6.7-6.34.1, 0.1.75:libgnutls30-3.6.7-6.34.1, …), 556 product×package rows across 140 product lines (Container caasp/v4/389-ds, Container caasp/v4/busybox, … (140 product lines)): Fixed 347, Known Affected 157, Known Not Affected 52. | https://www.suse.com/security/cve/CVE-2020-24659/ |
ubuntu
|
medium | CVE-2020-24659 medium priority: Ubuntu including 1 source packages (gnutls28), 5 status rows across 5 suites (bionic, focal, trusty, upstream, xenial): not-affected 2, released 2, DNE 1. | https://ubuntu.com/security/CVE-2020-24659 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| gnu | gnutls | < 3.6.15 | cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 32 | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| opensuse | leap | 15.1 | cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* |
| opensuse | leap | 15.2 | cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 20.04 | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* |
| URL | タグ |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html | Mailing List Third Party Advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html | Mailing List Third Party Advisory |
| https://gitlab.com/gnutls/gnutls/-/issues/1071 | Exploit Issue Tracking Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/ | |
| https://security.gentoo.org/glsa/202009-01 | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20200911-0006/ | Third Party Advisory |
| https://usn.ubuntu.com/4491-1/ | Third Party Advisory |
| https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04 | Vendor Advisory |