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 Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5586 advisory.

    Several vulnerabilities have been discovered in OpenSSH, an implementation of the SSH protocol suite.
    CVE-2021-41617 It was discovered that sshd failed to correctly initialise supplemental groups when     executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand, where a AuthorizedKeysCommandUser or     AuthorizedPrincipalsCommandUser directive has been set to run the command as a different user. Instead     these commands would inherit the groups that sshd was started with. CVE-2023-28531 Luci Stanescu reported     that a error prevented constraints being communicated to the ssh-agent when adding smartcard keys to the     agent with per-hop destination constraints, resulting in keys being added without constraints.
    CVE-2023-48795 Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that the SSH protocol is     prone to a prefix truncation attack, known as the Terrapin attack. This attack allows a MITM attacker to     effect a limited break of the integrity of the early encrypted SSH transport protocol by sending extra     messages prior to the commencement of encryption, and deleting an equal number of consecutive messages     immediately after encryption starts. Details can be found at https://terrapin-attack.com/ CVE-2023-51384     It was discovered that when PKCS#11-hosted private keys were added while specifying destination     constraints, if the PKCS#11 token returned multiple keys then only the first key had the constraints     applied. CVE-2023-51385 It was discovered that if an invalid user or hostname that contained shell     metacharacters was passed to ssh, and a ProxyCommand, LocalCommand directive or match exec predicate     referenced the user or hostname via expansion tokens, then an attacker who could supply arbitrary     user/hostnames to ssh could potentially perform command injection. The situation could arise in case of     git repositories with submodules, where the repository could contain a submodule with shell characters in     its user or hostname. For the oldstable distribution (bullseye), these problems have been fixed in version     1:8.4p1-5+deb11u3. For the stable distribution (bookworm), these problems have been fixed in version     1:9.2p1-2+deb12u2. We recommend that you upgrade your openssh packages. For the detailed security status     of openssh please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/openssh

Tenable has extracted the preceding description block directly from the Debian 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 Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6565-1 advisory.

    It was discovered that OpenSSH incorrectly handled supplemental groups when running helper programs for     AuthorizedKeysCommand and AuthorizedPrincipalsCommand as a different user. An attacker could possibly use     this issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-41617)

    It was discovered that OpenSSH incorrectly added destination constraints when PKCS#11 token keys were     added to ssh-agent, contrary to expectations. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 23.04.
    (CVE-2023-51384)

    It was discovered that OpenSSH incorrectly handled user names or host names with shell metacharacters. An     attacker could possibly use this issue to perform OS command injection. (CVE-2023-51385)

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.

sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows privilege escalation because supplemental groups are not initialized as expected. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

ID	Name	Product	Family	Published	Updated	Severity
164611	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.20.3)	Nessus	Misc.	9/1/2022	10/7/2025	high
187213	Debian DSA-5586-1 : openssh - security update	Nessus	Debian Local Security Checks	12/22/2023	1/24/2025	critical
187627	Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : OpenSSH vulnerabilities (USN-6565-1)	Nessus	Ubuntu Local Security Checks	1/3/2024	9/3/2025	high
503925	Siemens SIMATIC S7-1500 Missing Encryption of Sensitive Data (CVE-2021-41617)	Tenable OT Security	Tenable.ot	11/13/2025	11/13/2025	high

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