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

  - Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

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

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9465 advisory.

    - Resolves: CVE-2021-28651 squid: Bug 5104: Memory leak in RFC 2169 response parsing (#778)
    - Resolves: CVE-2021-28652 squid: Bug 5106: Broken cache manager URL parsing (#788)
    - Resolves: CVE-2021-31806,31807,31808 squid: Handle more Range requests (#790)

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

According to the versions of the squid package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

  - An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic. (CVE-2021-28662)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

  - An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

  - Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-2820:01 advisory.

    * squid: denial of service in URN processing (CVE-2021-28651)
      * squid: denial of service issue in Cache Manager (CVE-2021-28652)
      * squid: denial of service in HTTP response processing (CVE-2021-28662)
      * squid: improper input validation in HTTP Range header (CVE-2021-31806)
      * squid: incorrect memory management in HTTP Range header (CVE-2021-31807)
      * squid: integer overflow in HTTP Range header (CVE-2021-31808)
      * squid: denial of service in HTTP response processing (CVE-2021-33620)

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

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

Several vulnerabilities were discovered in Squid, a proxy caching server. 

CVE-2021-28651

Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.

CVE-2021-28652

Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

CVE-2021-31806

Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.

CVE-2021-31807

An integer overflow problem allows a remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.

CVE-2021-31808

Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.

CVE-2021-33620

Remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.

For Debian 9 stretch, these problems have been fixed in version 3.5.23-5+deb9u7.

We recommend that you upgrade your squid3 packages.

For the detailed security status of squid3 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/squid3

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the squid package has been released.

According to the versions of the squid packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.12 and 5.x     before 5.0.3. Due to use of a potentially dangerous     function, Squid and the default certificate validation     helper are vulnerable to a Denial of Service when     opening a TLS connection to an attacker-controlled     server for HTTPS. This occurs because unrecognized     error values are mapped to NULL, but later code expects     that each error value is mapped to a valid error     string.(CVE-2020-14058)

  - An issue was discovered in Squid through 4.13 and 5.x     through 5.0.4. Due to improper input validation, it     allows a trusted client to perform HTTP Request     Smuggling and access services otherwise forbidden by     the security controls. This occurs for certain     uri_whitespace configuration settings.(CVE-2020-25097)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all     clients using the proxy). A client sends an HTTP Range     request to trigger this.(CVE-2021-31808)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to a buffer-management bug, it allows     a denial of service. When resolving a request with the     urn: scheme, the parser leaks a small amount of memory.
    However, there is an unspecified attack methodology     that can easily trigger a large amount of memory     consumption.(CVE-2021-28651)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all     clients using the proxy) via HTTP Range request     processing.(CVE-2021-31806)

  - Squid before 4.15 and 5.x before 5.0.6 allows remote     servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The     issue trigger is a header that can be expected to exist     in HTTP traffic without any malicious intent by the     server.(CVE-2021-33620)

  - An issue was discovered in Squid before 4.15 and 5.x     before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when     delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in     HTTP traffic without any malicious     intent.(CVE-2021-31807)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of squid installed on the remote host is prior to 3.5.20-17. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-1950 advisory.

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

    Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

    A flaw was found in squid. A trusted client can directly access the cache manager information, bypassing     the manager ACL protection and resulting in information disclosure. (CVE-2022-41317)

Tenable has extracted the preceding description block directly from the tested product 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
252433	Linux Distros Unpatched Vulnerability : CVE-2021-33620	Nessus	Misc.	2025/8/20	2025/8/20	medium
153665	Oracle Linux 7 : squid (ELSA-2021-9465)	Nessus	Oracle Linux Local Security Checks	2021/9/24	2024/10/22	high
153671	EulerOS 2.0 SP5 : squid (EulerOS-SA-2021-2519)	Nessus	Huawei Local Security Checks	2021/9/27	2023/11/29	high
294522	MiracleLinux 8 : squid:4 (AXSA:2021-2820:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
150796	Debian DLA-2685-1 : squid3 security update	Nessus	Debian Local Security Checks	2021/6/15	2023/12/21	high
151955	Photon OS 3.0: Squid PHSA-2021-3.0-0269	Nessus	PhotonOS Local Security Checks	2021/7/22	2025/8/22	medium
151967	Photon OS 4.0: Squid PHSA-2021-4.0-0063	Nessus	PhotonOS Local Security Checks	2021/7/22	2025/8/22	medium
153296	EulerOS 2.0 SP2 : squid (EulerOS-SA-2021-2433)	Nessus	Huawei Local Security Checks	2021/9/14	2023/11/30	high
171805	Amazon Linux 2 : squid (ALAS-2023-1950)	Nessus	Amazon Linux Local Security Checks	2023/2/22	2024/12/11	medium

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