Vulnerability · Published Jul 10, 2025 · Assigned by VulnCheck

CVE-2025-34095Mako Server v2.5 and v2.6 OS Command Injection via examples/save.lsp

Critical 9.3

In plain English

A critical-severity OS command injection in Mako Server from Real Time Logic. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.2% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)6.2%top 6.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Metasploit

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Real Time Logic	Mako Server	2.5 – through 2.6

Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/makoserver_cmd_exec.rb exploit
https://www.exploit-db.com/exploits/43132 exploit
https://vulncheck/advisories/mako-server-rce third-party-advisory