Observable Timing Discrepancy vulnerability in Apache Shiro. This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7. Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue. Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force attack may be able to tell, by timing the requests only, determine if the request failed because of a non-existent user vs. wrong password. The most likely attack vector is a local attack only. Shiro security model https://shiro.apache.org/security-model.html#username_enumeration discusses this as well. Typically, brute force attack can be mitigated at the infrastructure level.

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

  - Observable Timing Discrepancy vulnerability in Apache Shiro. This issue affects Apache Shiro: from 1.*,
    2.* before 2.0.7. Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue. Prior
    to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force
    attack may be able to tell, by timing the requests only, determine if the request failed because of a non-
    existent user vs. wrong password. The most likely attack vector is a local attack only. Shiro security
    model https://shiro.apache.org/security-model.html#username_enumeration discusses this as well. Typically,
    brute force attack can be mitigated at the infrastructure level. (CVE-2026-23901)

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

  - Observable Timing Discrepancy vulnerability in Apache Shiro. This issue affects Apache Shiro: from 1.*,     2.* before 2.0.7. Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue. Prior     to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force     attack may be able to tell, by timing the requests only, determine if the request failed because of a non-     existent user vs. wrong password. The most likely attack vector is a local attack only. Shiro security     model https://shiro.apache.org/security-model.html#username_enumeration discusses this as well. Typically,     brute force attack can be mitigated at the infrastructure level. (CVE-2026-23901)

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

ID	Name	Product	Family	Type	Severity
463667	Echo: org.apache.shiro:shiro-core: security update to 2.1.0	Tenable Cloud Security	Echo Local Security Checks	Local	low
463667	Echo: org.apache.shiro:shiro-core: security update to 2.1.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	low
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
437682	SCA: security update for org.apache.shiro:shiro-core (GHSA-c4qc-4q9p-m9q9)	Tenable Cloud Security	SCA Checks	Local	low
437682	SCA: security update for org.apache.shiro:shiro-core (GHSA-c4qc-4q9p-m9q9)	Tenable Self-Hosted Container Security	SCA Checks	Local	low
298459	Linux Distros Unpatched Vulnerability : CVE-2026-23901	Nessus	Misc.	Local	low

Detections

Analytics

CVE-2026-23901

low

Tenable Plugins

low

low

high

low

low

low