res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.
総合評価: CVE-2021-46837 は中リスク（53.8/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 1.75%、75 パーセンタイル） 根拠: 直近 1 日で EPSS が +1.62% 上昇。悪用への関心が高まっている可能性があります。 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 | 0.13% | 1.75% | +1.62% |
| 2 | 2026-01-16 | 0.23% | 0.13% | -0.09% |
| 3 | 2025-11-21 | — | 0.23% | — |
EPSS の全履歴 （全 11 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 |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2021-46837: 1 source package rows (asterisk); 35 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 35. | https://security.alpinelinux.org/vuln/CVE-2021-46837 |
debian
|
not yet assigned | CVE-2021-46837 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-2021-46837 |
ubuntu
|
medium | CVE-2021-46837 medium priority: Ubuntu including 1 source packages (asterisk), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 8, needs-triage 3, ignored 1, released 1. | https://ubuntu.com/security/CVE-2021-46837 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:* |
| asterisk | certified_asterisk | 16.8.0 | cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:* |
| digium | asterisk | >= 16.0.0, < 16.16.2 | cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* |
| digium | asterisk | >= 17.0.0, < 17.9.3 | cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* |
| digium | asterisk | >= 18.0.0, < 18.2.2 | cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://downloads.asterisk.org/pub/security/AST-2021-006.html | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html | Mailing List Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5285 | Third Party Advisory |