CVE-2025-34027

Description

The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The Spack upload endpoint can be leveraged for a Time-of-Check to Time-of-Use (TOCTOU) write in combination with a race condition to achieve remote code execution via path loading manipulation, allowing an unauthenticated actor to achieve remote code execution (RCE).This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.

PUBLISHED Reserved 2025-04-15 | Published 2025-05-21 | Updated 2026-02-26 | Assigner VulnCheck

Problem types

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

Credits

ProjectDiscovery sponsor

Harsh Jaiswal finder

Rahul Maini finder

Parth Malhotra finder

References

projectdiscovery.io/...sa-concerto-authentication-bypass-rce exploit

projectdiscovery.io/...sa-concerto-authentication-bypass-rce exploit mitigation

cve.org (CVE-2025-34027)

nvd.nist.gov (CVE-2025-34027)

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