There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and
    18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.
    (CVE-2020-35776)

  - Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and
    Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure
    calls by replaying SRTP packets. (CVE-2021-26712)

  - A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before
    17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC
    client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is
    caused by a signedness comparison mismatch. (CVE-2021-26713)

  - An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before
    18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote
    response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened,
    and the remote responded with a declined T.38 stream, then Asterisk would crash. (CVE-2021-26717)

  - 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. (CVE-2021-26906)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before
    18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote
    response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened,
    and the remote responded with a declined T.38 stream, then Asterisk would crash. (CVE-2021-26717)

  - 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. (CVE-2020-28327)

  - An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x
    before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is
    received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that
    contains a tel-uri in the Diversion header. (CVE-2020-35652)

  - A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and
    18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.
    (CVE-2020-35776)

  - Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and
    Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure
    calls by replaying SRTP packets. (CVE-2021-26712)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and
    Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure
    calls by replaying SRTP packets. (CVE-2021-26712)

  - A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before
    17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC
    client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is
    caused by a signedness comparison mismatch. (CVE-2021-26713)

  - An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before
    18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote
    response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened,
    and the remote responded with a declined T.38 stream, then Asterisk would crash. (CVE-2021-26717)

  - 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. (CVE-2021-26906)

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - 在 16.16.1之前的 [] 之前、 17.x 之前的 17.9.2之前的 18.x 和 [ 18.2.1 ] 之前的 以及 Certified Asterisk 16.8-cert6 之前的 版中res_rtp_asterisk.c 存有一個堆疊型緩衝區溢位可允許經驗證的 WebRTC 用戶端透過傳送多個連續保留/取消保留要求。這是由不相符的正負號比較所造成。 (CVE-2021-26713)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 在低于 16.16.1的Sangoma Asterisk、低于 17.9.2的 17.x Sangoma Asterisk和低于 18.x18.2.1 ] 的Certified Asterisk 以及低于 16.8-cert6 的 Certified Asterisk 中res_rtp_asterisk.c 存在一个基于堆栈的缓冲区溢出允许经身份验证的 WebRTC 客户端通过发送多个缓冲区溢出来造成 Asterisk 崩溃。快速连续地保持/取消保持请求。这是由于符号比较不匹配所致。 (CVE-2021-26713)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

远程主机受到 GLSA-202412-03 中所述漏洞的影响（Asterisk：多个漏洞）

    在 Asterisk 中发现多个漏洞。请检查下方引用的 CVE 标识符以了解详细信息。

Tenable 已直接从 Gentoo Linux 安全公告中提取上述描述块。

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

遠端主機受到 GLSA-202412-03 中所述的弱點影響 (Asterisk：多個弱點)

    在 Asterisk 中發現多個弱點。如需詳細資訊，請檢閱下方提及的 CVE 識別碼。

Tenable 已直接從 Gentoo Linux 安全公告擷取前置描述區塊。

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - Sangoma Asterisk より前の 16.16.1、 17.x より前の 17.9.2]、 18.x より前の 18.2.1 、および 16.8-cert6 より前の Certified Asterisk の res_rtp_asterisk.c にあるスタックベースのバッファオーバーフローにより、認証された WebRTC クライアントが複数のメッセージを送信することで Asterisk のクラッシュを引き起こす可能性があります。すばやく連続してリクエストの保留/保留解除を行うこれは、符号比較の不一致によって引き起こされます。CVE-2021-26713

Nessus は、ベンダーによって報告されたパッケージの存在に依存していることに注意してください。

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before     17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC     client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is     caused by a signedness comparison mismatch. (CVE-2021-26713)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote host is affected by the vulnerability described in GLSA-202412-03 (Asterisk: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review the CVE identifiers referenced     below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
403580	Alpine: asterisk: security update to 16.16.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	2023/10/31	2026/7/2	high
400268	Alpine: multiple asterisk packages: security update to 18.1.1-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	2023/8/16	2026/7/2	high
423684	Alpine: multiple asterisk packages: security update to 18.2.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	2025/4/4	2026/7/2	high
400268	Alpine: multiple asterisk packages: security update to 18.1.1-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	2023/8/16	2026/7/2	high
423684	Alpine: multiple asterisk packages: security update to 18.2.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	2025/4/4	2026/7/2	high
403580	Alpine: asterisk: security update to 16.16.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	2023/10/31	2026/7/2	high
252401	Linux Distros 未修補的弱點：CVE-2021-26713	Nessus	Misc.	2025/8/20	2026/7/21	medium
252401	Linux Distros 未修补的漏洞：CVE-2021-26713	Nessus	Misc.	2025/8/20	2026/7/21	medium
212188	GLSA-202412-03：Asterisk：多个漏洞	Nessus	Gentoo Local Security Checks	2024/12/9	2024/12/9	critical
212188	GLSA-202412-03：Asterisk：多個弱點	Nessus	Gentoo Local Security Checks	2024/12/9	2024/12/9	critical
252401	Linux Distros のパッチ未適用の脆弱性: CVE-2021-26713	Nessus	Misc.	2025/8/20	2026/7/21	medium
252401	Linux Distros Unpatched Vulnerability : CVE-2021-26713	Nessus	Misc.	2025/8/20	2026/7/21	medium
212188	GLSA-202412-03 : Asterisk: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	2024/12/9	2024/12/9	critical

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