CISA's required action for CVE-2025-24813 is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. In practice, find every instance of Apache Tomcat in your estate, apply the vendor security update or documented mitigation, and if no fix can be applied, remove internet exposure or take the product out of service.
What CVE-2025-24813 means operationally
apache tomcat path equivalence issues are handled as an exposure-management problem first and a code-fix problem second. The question is not only whether a security update exists, but whether every Tomcat instance is found, confirmed, and brought under a supported remediation path. Use the vendor advisory and the CISA Known Exploited Vulnerabilities Catalog to confirm the required action and any cloud-service handling guidance before you change production systems.
For this class of flaw, the practical sequence is straightforward: inventory all Tomcat deployments, verify whether each one is internet-facing or otherwise exposed to untrusted traffic, then apply the vendor security update or documented mitigation. If your environment includes cloud-hosted services, follow any applicable BOD 22-01 guidance referenced by CISA, because cloud exposure changes how quickly you should isolate or retire a vulnerable service when patch timing slips.
When Tomcat is embedded in a larger application platform, patching the application image alone is not enough if the runtime is still deployed elsewhere. Treat Tomcat as an asset class, not just a package name. Reconfirm where it runs, which environments replicate it, and whether any load-balanced, containerised, or legacy instances were missed during the first pass.
When mitigation is the only option
If the vendor fix or documented mitigation cannot be applied immediately, the safest temporary measure is to remove internet exposure or take the product out of service until a supported remediation is in place. That is especially important where Tomcat is directly reachable from the public edge, because a path-equivalence flaw can be reachable before routine vulnerability scans or change windows catch up.
The decision point is whether the service can stay online without accepting the risky path semantics in the first place. If you cannot prove that the mitigation is active and durable, do not rely on compensating controls such as firewall rules alone unless they genuinely remove the reachable attack surface. In practice, service removal or isolation is the cleaner choice when the system cannot be patched promptly.
Use NIST Cybersecurity Framework 2.0 to structure the operational response around identification, protection, detection, response, and recovery. That helps teams avoid a narrow patch-only workflow and instead confirm asset scope, blast radius, and restoration readiness while remediation is underway.
What to check after patching or isolation
After remediation, validate that the vulnerable Tomcat instance was not already used as an entry point. Check access logs, application logs, reverse proxy logs, and any alerting around unusual file access, unexpected request paths, or new web content. If the server was reachable from the public internet before it was fixed, assume the chance of prior probing is higher and widen the review window accordingly.
If Tomcat hosted applications with administrative sessions, API tokens, deployment credentials, or other secret material on disk or in memory, rotate the relevant secrets where exposure is plausible. A path-equivalence flaw can become an enabler for follow-on access if an attacker used it to reach files, configuration data, or session material that should not have been reachable through the web tier.
Keep proof of remediation, including the exact instances found, the version or mitigation applied, the date exposure was removed, and the validation method used afterward. That evidence matters if the service reappears later in another environment or if a downstream team inherits the same Tomcat build without knowing it was previously affected.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AA-05 — Identity Management, Authentication, and Access Control | Tomcat exposure and mitigation depend on controlling reachable access paths. |
| ID.AM-01 — Physical devices and systems within the organization are inventoried | The answer depends on finding every Tomcat instance before fixing it. | |
| PR.PS-01 — Configuration management | Applying vendor updates or mitigations is a configuration-control action. | |
| Recommendation — Restrict and verify access paths before returning the service to production. Inventory all Tomcat deployments so none are missed during remediation. Apply the vendor fix or documented mitigation and record the change. | ||
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | You must locate all Tomcat instances before remediation can be complete. |
| Recommendation — Maintain a complete Tomcat component inventory and close any discovery gaps. | ||
Practitioner Guidance
What to prioritise: Prioritise exposure removal on the most reachable Tomcat instances first, especially internet-facing systems and shared platforms that host multiple applications. Those are the places where a short remediation delay creates the largest blast radius.
What to verify: Verify that every Tomcat deployment is accounted for, that the approved mitigation is actually in place, and that no alternate instance remains exposed in another subnet, container image, or cloud account. A single missed instance is enough to keep the problem alive.
Decision rule: If you cannot patch promptly and cannot prove a durable mitigation, remove the service from exposure or take it offline until you can. For this CVE, “temporarily acceptable” is only defensible when the attack surface is actually closed.
Practitioner takeaway: Treat CVE-2025-24813 as an exposure-control problem, not just a patch ticket, because the real failure mode is leaving an exploitable Tomcat instance reachable while believing it has been addressed.
Related resources from NHI Mgmt Group
- Guide: Zero-Day and Exploited Vulnerabilities Guide
- Is CVE-2025-24813 (Apache Tomcat Path Equivalence) being exploited in the wild?
- CVE-2025-24813 (Apache Tomcat Path Equivalence)
- How do you patch or mitigate CVE-2025-34028 (Commvault Command Center Path Traversal)?
- How do you patch or mitigate CVE-2025-2749 (Kentico Xperience Path Traversal)?
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Reviewed and updated by the NHIMG editorial team on October 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org