The version of AOS installed on the remote host is prior to 5.20.3. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AOS-5.20.3 advisory.

  - xpointer.c in libxml2 before 2.9.5 (as used in Apple iOS before 10, OS X before 10.12, tvOS before 10, and     watchOS before 3, and other products) does not forbid namespace nodes in XPointer ranges, which allows     remote attackers to execute arbitrary code or cause a denial of service (use-after-free and memory     corruption) via a crafted XML document. (CVE-2016-4658)

  - NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow     when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures     encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12 are likely to be impacted. Applications using NSS for     certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how     they configure NSS. *Note: This vulnerability does NOT impact Mozilla Firefox.* However, email clients and     PDF viewers that use NSS for signature verification, such as Thunderbird, LibreOffice, Evolution and     Evince are believed to be impacted. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.
    (CVE-2021-43527)

  - Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP     transfer-encoding request header in some circumstances leading to the possibility to request smuggling     when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if     the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding;
    and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
    (CVE-2021-33037)

  - A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked     down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to further increase their privileges to that of a     running kernel. (CVE-2020-27777)

  - A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c.
    This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name     space (CVE-2021-22555)

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

The remote Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5273-1 advisory.

    Demi M. Obenour discovered that RPM Package Manager incorrectly handled certain files. An attacker could     possibly use this issue to corrupt the database and cause a denial of service. (CVE-2021-3421,     CVE-2021-20271)

    Demi M. Obenour discovered that RPM Package Manager incorrectly handled memory when processing certain     data from the database. An attacker could possibly use this issue to cause a denial of service. This issue     only affects Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-20266)

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

  - A flaw was found in RPM's signature check functionality when reading a package file. This flaw allows an     attacker who can convince a victim to install a seemingly verifiable package, whose signature header was     modified, to cause RPM database corruption and execute code. The highest threat from this vulnerability is     to data integrity, confidentiality, and system availability. (CVE-2021-20271)

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

An update of the rpm package has been released.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:2574 advisory.

  - rpm: Signature checks bypass via corrupted rpm package (CVE-2021-20271)

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

According to the versions of the rpm packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in RPM's signature check functionality     when reading a package file. This flaw allows an     attacker who can convince a victim to install a     seemingly verifiable package, whose signature header     was modified, to cause RPM database corruption and     execute code. The highest threat from this     vulnerability is to data integrity, confidentiality,     and system availability.(CVE-2021-20271)

  - A flaw was found in RPM's hdrblobInit() in     lib/header.c. This flaw allows an attacker who can     modify the rpmdb to cause an out-of-bounds read. The     highest threat from this vulnerability is to system     availability.(CVE-2021-20266)

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 Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:4785 advisory.

    The RPM Package Manager (RPM) is a command-line driven package management system capable of installing,     uninstalling, verifying, querying, and updating software packages.

    Security Fix(es):

    * rpm: Signature checks bypass via corrupted rpm package (CVE-2021-20271)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 host is affected by the vulnerability described in GLSA-202107-43 (RPM: Multiple vulnerabilities)

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

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2021:2574 advisory.

  - A flaw was found in RPM's signature check functionality when reading a package file. This flaw allows an     attacker who can convince a victim to install a seemingly verifiable package, whose signature header was     modified, to cause RPM database corruption and execute code. The highest threat from this vulnerability is     to data integrity, confidentiality, and system availability. (CVE-2021-20271)

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	Published	Updated	Severity
164611	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.20.3)	Nessus	Misc.	9/1/2022	7/24/2026	high
183159	Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM : RPM Package Manager vulnerabilities (USN-5273-1)	Nessus	Ubuntu Local Security Checks	10/16/2023	8/27/2024	high
259238	Linux Distros Unpatched Vulnerability : CVE-2021-20271	Nessus	Misc.	8/30/2025	8/7/2026	high
148905	Photon OS 1.0: Rpm PHSA-2021-1.0-0383	Nessus	PhotonOS Local Security Checks	4/21/2021	7/22/2024	high
151151	CentOS 8 : rpm (CESA-2021:2574)	Nessus	CentOS Local Security Checks	6/30/2021	6/30/2021	high
151160	EulerOS Virtualization for ARM 64 3.0.6.0 : rpm (EulerOS-SA-2021-2015)	Nessus	Huawei Local Security Checks	6/30/2021	12/12/2023	high
155686	RHEL 7 : rpm (RHSA-2021:4785)	Nessus	Red Hat Local Security Checks	11/23/2021	11/7/2024	high
157016	GLSA-202107-43 : RPM: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/24/2022	1/26/2022	high
157653	AlmaLinux 8 : rpm (ALSA-2021:2574)	Nessus	Alma Linux Local Security Checks	2/9/2022	2/14/2022	high

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