The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-2988 advisory.

    - Resolves: #1982861 - CVE-2021-36740 varnish:6/varnish: HTTP/2 request       smuggling attack via a large Content-Length header for a POST request

    varnish-modules

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

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

The remote CentOS Linux 9 host has packages installed that are affected by a vulnerability as referenced in the varnish-6.5.2-2.el9 build changelog.

  - HTTP/2 request smuggling attack via a large Content-Length header for a POST request (CVE-2021-36740)

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

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:2988 advisory.

  - Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large     Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and     Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8. (CVE-2021-36740)

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2021:0053 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-36740:
    Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large     Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and     Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8.

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

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

The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2021-2381:01 advisory.

    * varnish: HTTP/2 request smuggling attack via a large Content-Length header for a POST request     (CVE-2021-36740)

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

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

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-2021_2988 advisory.

    * varnish: HTTP/2 request smuggling attack via a large Content-Length header for a POST request     (CVE-2021-36740)

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

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

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0265 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

      CVE-2022-45060:
      An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x before 6.0.11, 7.x before     7.1.2, and 7.2.x before 7.2.1. An attacker may introduce characters through HTTP/2 pseudo-headers that are     invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1     requests to the backend. This could, in turn, be used to exploit vulnerabilities in a server behind the     Varnish server. Note: the 6.0.x LTS series (before 6.0.11) is affected.

      CVE-2021-36740:
      Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large     Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and     Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8.

Tenable has extracted the preceding description block directly from the Tencent 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.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2022:0148-1 advisory.

  - Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large     Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and     Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8. (CVE-2021-36740)

  - In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish     Enterprise (Cache Plus) 4.1.x before 4.1.11r6 and 6.0.x before 6.0.9r4, request smuggling can occur for     HTTP/1 connections. (CVE-2022-23959)

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

ID	Name	Product	Family	Published	Updated	Severity
152184	Oracle Linux 8 : varnish:6 (ELSA-2021-2988)	Nessus	Oracle Linux Local Security Checks	8/3/2021	10/22/2024	medium
191203	CentOS 9 : varnish-6.5.2-2.el9	Nessus	CentOS Local Security Checks	2/29/2024	4/26/2024	medium
184784	Rocky Linux 8 : varnish:6 (RLSA-2021:2988)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/6/2023	medium
236639	Alibaba Cloud Linux 3 : 0053: varnish:6 (ALINUX3-SA-2021:0053)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	5/14/2025	medium
294515	MiracleLinux 8 : varnish:6 (AXSA:2021-2381:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	medium
358796	Rocky Linux 8 [CIQ] Security Update: varnish / varnish-devel / varnish-docs / varnish-modules / etc (crlsa-2021_2988)	Nessus	Rocky Linux Local Security Checks	10/1/2026	10/1/2026	medium
238812	TencentOS Server 3: varnish (TSSA-2022:0265)	Nessus	Tencent Local Security Checks	6/16/2025	12/5/2025	high
161654	openSUSE 15 Security Update : varnish (openSUSE-SU-2022:0148-1)	Nessus	SuSE Local Security Checks	5/28/2022	5/28/2022	critical

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