How severe is CVE-2025-27142?

CVE-2025-27142 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-27142 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27142?

CVE-2025-27142 affects Localsend. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27142?

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-2025-27142 have an EU (EUVD) identifier?

Yes. CVE-2025-27142 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5325.

When was CVE-2025-27142 published?

CVE-2025-27142 was published on 2025-02-25 and last updated on 2026-06-17.

CVE-2025-27142

CVE-2025-27142 is a high-severity vulnerability in Localsend with a CVSS 3.x base score of 8.8. 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-22.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 6.3
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-5325
Weakness: CWE-22
Affected product: Localsend
Published: 2025-02-25
Last modified: 2026-06-17

Description

LocalSend is a free, open-source app that allows users to securely share files and messages with nearby devices over their local network without needing an internet connection. Prior to version 1.17.0, due to the missing sanitization of the path in the `POST /api/localsend/v2/prepare-upload` and the `POST /api/localsend/v2/upload` endpoint, a malicious file transfer request can write files to the arbitrary location on the system, resulting in the remote command execution. A malicious file transfer request sent by nearby devices can write files into an arbitrary directory. This usually allows command execution via the startup folder on Windows or Bash-related files on Linux. If the user enables the `Quick Save` feature, it will silently write files without explicit user interaction. Version 1.17.0 fixes this issue.

Frequently asked questions

What is CVE-2025-27142?: LocalSend is a free, open-source app that allows users to securely share files and messages with nearby devices over their local network without needing an internet connection. Prior to version 1.17.0, due to the missing sanitization of the path in the `POST /api/localsend/v2/prepare-upload` and the `POST /api/localsend/v2/upload` endpoint, a malicious file transfer request can write files to the arbitrary location on the system, resulting in the remote command execution. A malicious file transfer request sent by nearby devices can write files into an arbitrary directory. This usually allows command execution via the startup folder on Windows or Bash-related files on Linux. If the user enables the `Quick Save` feature, it will silently write files without explicit user interaction. Version 1.17.0 fixes this issue.
How severe is CVE-2025-27142?: CVE-2025-27142 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-27142 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27142?: CVE-2025-27142 affects Localsend. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27142?: 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-2025-27142 have an EU (EUVD) identifier?: Yes. CVE-2025-27142 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5325.
When was CVE-2025-27142 published?: CVE-2025-27142 was published on 2025-02-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:localsend:localsend:*:*:*:*:*:*:*:*

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