Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.

Add IAVM ID - Multiple Vulnerabilities in Apache ZooKeeper

The version of IBM Engineering Requirements Management DOORS (formerly IBM Rational DOORS) installed on the remote host is 9.6.1.1 prior or equal to 9.6.1.13 or 9.7.2.1 prior or equal to 9.7.2.11. It is, therefore, affected by multiple vulnerabilities as referenced in the 7279145 advisory.

  - IBM DOORS Web Access do not limit the length of a connection which could allow for a Slowloris HTTP denial     of service attack to take place. This can cause the web server to become unresponsive. (CVE-2024-25039)

  - IBM DOORS Web Access is vulnerable to cross-site scripting. This vulnerability allows an unauthenticated     attacker to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality     potentially leading to credentials disclosure within a trusted session. (CVE-2025-0152)

  - IBM DOORS Web Access could allow a remote attacker to obtain sensitive information when a detailed     technical error message is returned in the browser. This information could be used in further attacks     against the system. (CVE-2020-4984)

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

The version of Apache ZooKeeper listening on the remote host is 3.8.x prior to 3.8.6 or 3.9.x prior to 3.9.5. It is, therefore, affected by multiple vulnerabilities:

  - Improper handling of configuration values in ZKConfig allows an attacker to expose sensitive     information stored in client configuration in the client's logfile. Configuration values are     exposed at INFO level logging, rendering potential production systems affected by the issue.
    (CVE-2026-24308)

  - Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR)     when IP SAN validation fails, allowing attackers who control or spoof PTR records to     impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. Note     that an attacker must present a certificate which is trusted by ZKTrustManager, which makes     the attack vector harder to exploit. (CVE-2026-24281)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN
    validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or
    clients with a valid certificate for the PTR name. It's important to note that attacker must present a
    certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are
    recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new
    configuration option to disable reverse DNS lookup in client and quorum protocols. (CVE-2026-24281)

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

  - Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN     validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or     clients with a valid certificate for the PTR name. It's important to note that attacker must present a     certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are     recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new     configuration option to disable reverse DNS lookup in client and quorum protocols. (CVE-2026-24281)

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

ID	Name	Product	Family	Type	Severity
333335	IBM Engineering Requirements Management DOORS 9.6.1.1 <= 9.6.1.13 / 9.7.2.1 < 9.7.2.11 Multiple Vulnerabilities (7279145)	Nessus	Windows	Local	high
301976	Apache ZooKeeper 3.8.x < 3.8.6 / 3.9.x < 3.9.5 Multiple Vulnerabilities	Nessus	Misc.	Combined	high
438625	SCA: security update for org.apache.zookeeper:zookeeper (GHSA-7xrh-hqfc-g7qr)	Tenable Cloud Security	SCA Checks	Local	high
438625	SCA: security update for org.apache.zookeeper:zookeeper (GHSA-7xrh-hqfc-g7qr)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
301660	Linux Distros Unpatched Vulnerability : CVE-2026-24281	Nessus	Misc.	Local	high

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