A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1. and Certified Asterisk before 16.8-cert5. Upon receiving a new SIP Invite, Asterisk did not return the created dialog locked or referenced. This caused a gap between the creation of the dialog object, and its next use by the thread that created it. Depending on some off-nominal circumstances and timing, it was possible for another thread to free said dialog in this gap. Asterisk could then crash when the dialog object, or any of its dependent objects, were dereferenced or accessed next by the initial-creation thread. Note, however, that this crash can only occur when using a connection-oriented protocol (e.g., TCP or TLS, but not UDP) for SIP transport. Also, the remote client must be authenticated, or Asterisk must be configured for anonymous calling.
総合評価: CVE-2020-28327 は悪用リスクが高い（63.2/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 1.97%、78 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 | 2.19% | 1.97% | -0.22% |
| 2 | 2026-05-30 | 2.76% | 2.19% | -0.58% |
| 3 | 2025-11-21 | — | 2.76% | — |
EPSS の全履歴 （全 14 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 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
1.6 | 3.6 | [email protected] |
| 2.1 | 2.0 | LOW |
|
3.9 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2020-28327: 1 source package rows (asterisk); 8 state rows across 8 repos (3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 0. | https://security.alpinelinux.org/vuln/CVE-2020-28327 |
debian
|
not yet assigned | CVE-2020-28327 not yet assigned priority: Debian including 1 source packages (asterisk), 3 status rows across 3 suites (bullseye, forky, sid): resolved 3. | https://security-tracker.debian.org/tracker/CVE-2020-28327 |
ubuntu
|
low | CVE-2020-28327 low priority: Ubuntu including 1 source packages (asterisk), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 10, needed 3, DNE 1, ignored 1, released 1. | https://ubuntu.com/security/CVE-2020-28327 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:* |
| digium | certified_asterisk | 16.8 | cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:* |
| sangoma | asterisk | >= 13.0.0, < 13.37.1 | cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* |
| sangoma | asterisk | >= 16.0.0, < 16.14.1 | cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* |
| sangoma | asterisk | >= 17.0.0, < 17.8.1 | cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* |
| sangoma | asterisk | >= 18.0.0, < 18.0.1 | cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://downloads.asterisk.org/pub/security/AST-2020-001.html | Patch Vendor Advisory |
| https://issues.asterisk.org/jira/browse/ASTERISK-29057 | Exploit Issue Tracking Vendor Advisory |