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

  - A flaw was found in Privoxy in versions before 3.0.29. Memory leaks in the show-status CGI handler when
    memory allocations fail can lead to a system crash. (CVE-2021-20215)

  - A flaw was found in Privoxy in versions before 3.0.29. Memory leak in the show-status CGI handler when no
    filter files are configured can lead to a system crash. (CVE-2021-20210)

  - A flaw was found in Privoxy in versions before 3.0.29. Memory leak when client tags are active can cause a
    system crash. (CVE-2021-20211)

  - A flaw was found in Privoxy in versions before 3.0.29. Memory leak if multiple filters are executed and
    the last one is skipped due to a pcre error leading to a system crash. (CVE-2021-20212)

  - A flaw was found in Privoxy in versions before 3.0.29. Dereference of a NULL-pointer that could result in
    a crash if accept-intercepted-requests was enabled, Privoxy failed to get the request destination from the
    Host header and a memory allocation failed. (CVE-2021-20213)

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4886-1 advisory.

    It was discovered that Privoxy incorrectly handled CGI requests. An attacker could possibly use this issue     to cause a denial of service or obtain sensitive information. (CVE-2020-35502, CVE-2021-20209,     CVE-2021-20210, CVE-2021-20213, CVE-2021-20215, CVE-2021-20216, CVE-2021-20217, CVE-2021-20272,     CVE-2021-20273, CVE-2021-20275)

    It was discovered that Privoxy incorrectly handled certain regular expressions. An attacker could possibly     use this issue to cause a denial of service or obtain sensitive information. (CVE-2021-20212,     CVE-2021-20276)

    It was discovered that Privoxy incorrectly handled client tags. An attacker could possibly use this issue     to cause Privoxy to consume resources, resulting in a denial of service. This issue only affected Ubuntu     18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-20211)

    It was discovered that Privoxy incorrectly handled client tags. An attacker could possibly use this issue     to cause Privoxy to consume resources, resulting in a denial of service. This issue only affected Ubuntu     20.04 LTS and Ubuntu 20.10. (CVE-2021-20214)

Tenable has extracted the preceding description block directly from the Ubuntu 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 host is affected by the vulnerability described in GLSA-202107-16 (Privoxy: Multiple vulnerabilities)

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

    An attacker could cause a possible Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Multiple vulnerabilites were discovered in privoxy, a privacy enhancing HTTP proxy, like memory leaks, dereference of a NULL pointer, et al.

For Debian 9 stretch, these problems have been fixed in version 3.0.26-3+deb9u1.

We recommend that you upgrade your privoxy packages.

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

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.

ID	Name	Product	Family	Published	Updated	Severity
424386	Alpine: multiple privoxy packages: security update to 3.0.29-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	high
424386	Alpine: multiple privoxy packages: security update to 3.0.29-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	high
147971	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Privoxy vulnerabilities (USN-4886-1)	Nessus	Ubuntu Local Security Checks	3/23/2021	9/3/2025	high
157017	GLSA-202107-16 : Privoxy: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/24/2022	1/16/2024	high
146283	Debian DLA-2548-1 : privoxy security update	Nessus	Debian Local Security Checks	2/8/2021	6/1/2021	high

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