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.

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 Ubuntu 18.04 LTS / 20.04 LTS / 21.10 / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5474-1 advisory.

  - An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before     6.3.1. It does not clear a pointer between the handling of one client request and the next request within     the same connection. This sometimes causes information to be disclosed from the connection workspace, such     as data structures associated with previous requests within this connection or VCL-related temporary     headers. (CVE-2019-20637)

  - An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before     6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an     assertion failure and daemon restart, which causes a performance loss. (CVE-2020-11653)

  - 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.

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.

The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5088 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 this issue but has instead relied only on the application's self-reported version number.

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

  - varnish: 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2988 advisory.

  - varnish: 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 Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2993 advisory.

  - varnish: 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 Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-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.

ID	Name	Product	Family	Severity
191203	CentOS 9 : varnish-6.5.2-2.el9	Nessus	CentOS Local Security Checks	medium
184784	Rocky Linux 8 : varnish:6 (RLSA-2021:2988)	Nessus	Rocky Linux Local Security Checks	medium
161982	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Varnish Cache vulnerabilities (USN-5474-1)	Nessus	Ubuntu Local Security Checks	critical
161654	openSUSE 15 Security Update : varnish (openSUSE-SU-2022:0148-1)	Nessus	SuSE Local Security Checks	critical
158585	Debian DSA-5088-1 : varnish - security update	Nessus	Debian Local Security Checks	critical
152358	CentOS 8 : varnish:6 (CESA-2021:2988)	Nessus	CentOS Local Security Checks	medium
152352	RHEL 8 : varnish:6 (RHSA-2021:2988)	Nessus	Red Hat Local Security Checks	medium
152347	RHEL 7 : rh-varnish6-varnish (RHSA-2021:2993)	Nessus	Red Hat Local Security Checks	medium
152184	Oracle Linux 8 : varnish:6 (ELSA-2021-2988)	Nessus	Oracle Linux Local Security Checks	medium

Detections

Analytics

CVE-2021-36740

medium

Tenable Plugins

medium

medium

critical

critical

critical

medium

medium

medium

medium