CVE-2025-34095
CVE-2025-34095 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-78.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.3)
- EPSS exploit prediction: 4% (90th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-21031
- Weakness: CWE-78
- Published:
- Last modified:
Description
An OS command injection vulnerability exists in Mako Server versions 2.5 and 2.6, specifically within the tutorial interface provided by the examples/save.lsp endpoint. An unauthenticated attacker can send a crafted PUT request containing arbitrary Lua os.execute() code, which is then persisted on disk and triggered via a subsequent GET request to examples/manage.lsp. This allows remote command execution on the underlying operating system, impacting both Windows and Unix-based deployments.
Frequently asked questions
- What is CVE-2025-34095?
- An OS command injection vulnerability exists in Mako Server versions 2.5 and 2.6, specifically within the tutorial interface provided by the examples/save.lsp endpoint. An unauthenticated attacker can send a crafted PUT request containing arbitrary Lua os.execute() code, which is then persisted on disk and triggered via a subsequent GET request to examples/manage.lsp. This allows remote command execution on the underlying operating system, impacting both Windows and Unix-based deployments.
- How severe is CVE-2025-34095?
- CVE-2025-34095 has a CVSS 4.0 base score of 9.3, rated critical severity.
- Is CVE-2025-34095 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-34095?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-34095 have an EU (EUVD) identifier?
- Yes. CVE-2025-34095 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21031.
- When was CVE-2025-34095 published?
- CVE-2025-34095 was published on 2025-07-10 and last updated on 2026-06-17.
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/makoserver_cmd_exec.rb
- https://vulncheck/advisories/mako-server-rce
- https://www.exploit-db.com/exploits/43132
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