Vulnerability in asterisk
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as DEBIAN-CVE-2021-26906 has been found in asterisk.
Risk of unauthorized operations or information disclosure.
What to do: upgrade asterisk to 1:16.16.1~dfsg-1 or later.
If unsure, ask your IT team or search "asterisk DEBIAN-CVE-2021-26906" on the vendor's site.
DEBIAN-CVE-2021-26906 (asterisk)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1:16.16.1~dfsg-1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in asterisk.
Check the vendor advisory for the affected versions of asterisk.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1:16.16.1~dfsg-1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'asterisk' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'asterisk' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
asteriskを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade asterisk to 1:16.16.1~dfsg-1ステージング環境で 1:16.16.1~dfsg-1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Debian:14 | asterisk |
< 1:16.16.1~dfsg-1 |
1:16.16.1~dfsg-1 |
Original description The description as published by the source.
An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org