How severe is CVE-2025-34078?

CVE-2025-34078 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-34078 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34078?

CVE-2025-34078 affects Nsclient Nsclient++. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-34078?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-34078 have an EU (EUVD) identifier?

Yes. CVE-2025-34078 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19753.

When was CVE-2025-34078 published?

CVE-2025-34078 was published on 2025-07-02 and last updated on 2026-06-17.

CVE-2025-34078

CVE-2025-34078 is a high-severity vulnerability in Nsclient Nsclient++ with a CVSS 3.x base score of 7.8. 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 7.3
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19753
Weakness: CWE-522
Affected product: Nsclient Nsclient++
Published: 2025-07-02
Last modified: 2026-06-17

Description

A local privilege escalation vulnerability exists in NSClient++ 0.5.2.35 when both the web interface and ExternalScripts features are enabled. The configuration file (nsclient.ini) stores the administrative password in plaintext and is readable by local users. By extracting this password, an attacker can authenticate to the NSClient++ web interface (typically accessible on port 8443) and abuse the ExternalScripts plugin to inject and execute arbitrary commands as SYSTEM by registering a custom script, saving the configuration, and triggering it via the API. This behavior is documented but insecure, as the plaintext credential exposure undermines access isolation between local users and administrative functions.

Frequently asked questions

What is CVE-2025-34078?: A local privilege escalation vulnerability exists in NSClient++ 0.5.2.35 when both the web interface and ExternalScripts features are enabled. The configuration file (nsclient.ini) stores the administrative password in plaintext and is readable by local users. By extracting this password, an attacker can authenticate to the NSClient++ web interface (typically accessible on port 8443) and abuse the ExternalScripts plugin to inject and execute arbitrary commands as SYSTEM by registering a custom script, saving the configuration, and triggering it via the API. This behavior is documented but insecure, as the plaintext credential exposure undermines access isolation between local users and administrative functions.
How severe is CVE-2025-34078?: CVE-2025-34078 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-34078 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34078?: CVE-2025-34078 affects Nsclient Nsclient++. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-34078?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-34078 have an EU (EUVD) identifier?: Yes. CVE-2025-34078 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19753.
When was CVE-2025-34078 published?: CVE-2025-34078 was published on 2025-07-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nsclient:nsclient\+\+:0.5.2.35:*:*:*:*:*:*:*

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