How severe is CVE-2025-8558?

CVE-2025-8558 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2025-8558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-8558?

CVE-2025-8558 affects Proofpoint Insider Threat Management Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-8558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-8558 have an EU (EUVD) identifier?

Yes. CVE-2025-8558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37519.

When was CVE-2025-8558 published?

CVE-2025-8558 was published on 2025-11-03 and last updated on 2026-06-17.

CVE-2025-8558

CVE-2025-8558 is a medium-severity vulnerability in Proofpoint Insider Threat Management Server with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 2.3
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37519
Weakness: CWE-306
Affected product: Proofpoint Insider Threat Management Server
Published: 2025-11-03
Last modified: 2026-06-17

Description

Insider Threat Management (ITM) Server versions prior to 7.17.2 contain an authentication bypass vulnerability that allows unauthenticated users on an adjacent network to perform agent unregistration when the number of registered agents exceeds the licensed limit. Successful exploitation prevents the server from receiving new events from affected agents, resulting in a partial loss of integrity and availability with no impact to confidentiality.

Frequently asked questions

What is CVE-2025-8558?: Insider Threat Management (ITM) Server versions prior to 7.17.2 contain an authentication bypass vulnerability that allows unauthenticated users on an adjacent network to perform agent unregistration when the number of registered agents exceeds the licensed limit. Successful exploitation prevents the server from receiving new events from affected agents, resulting in a partial loss of integrity and availability with no impact to confidentiality.
How severe is CVE-2025-8558?: CVE-2025-8558 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2025-8558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-8558?: CVE-2025-8558 affects Proofpoint Insider Threat Management Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-8558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-8558 have an EU (EUVD) identifier?: Yes. CVE-2025-8558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37519.
When was CVE-2025-8558 published?: CVE-2025-8558 was published on 2025-11-03 and last updated on 2026-06-17.

References

https://www.proofpoint.com/us/security/security-advisories/pfpt-sa-2025-003

Affected products (1)

cpe:2.3:a:proofpoint:insider_threat_management_server:*:*:*:*:*:*:*:*

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