How severe is CVE-2025-4878?

CVE-2025-4878 has a CVSS 3.x base score of 3.6, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-4878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-4878?

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

Does CVE-2025-4878 have an EU (EUVD) identifier?

Yes. CVE-2025-4878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22335.

When was CVE-2025-4878 published?

CVE-2025-4878 was published on 2025-07-22 and last updated on 2026-06-30.

CVE-2025-4878

CVE-2025-4878 is a low-severity vulnerability with a CVSS 3.x base score of 3.6. 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-416.

Key facts

Severity: Low (CVSS 3.x base score 3.6)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22335
Weakness: CWE-416
Published: 2025-07-22
Last modified: 2026-06-30

Description

A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption.

Frequently asked questions

What is CVE-2025-4878?: A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption.
How severe is CVE-2025-4878?: CVE-2025-4878 has a CVSS 3.x base score of 3.6, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-4878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-4878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4878 have an EU (EUVD) identifier?: Yes. CVE-2025-4878 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22335.
When was CVE-2025-4878 published?: CVE-2025-4878 was published on 2025-07-22 and last updated on 2026-06-30.

References

Other CWE-416 (Use After Free) vulnerabilities

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