CVE-2025-34027
9.0
CRITICAL · CVSS 3.1 · EPSS 45.2% (pctl 99)
Patch early
EPSS 45.2% — above the 10% action threshold.
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.
Scoring
| CVSS | 9.0 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 45.22% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-367 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2025-05-21 |
| Last modified | 2026-08-25 |
Affected (1)
| Vendor | Product |
|---|---|
| versa-networks | concerto |
References
→ the Explorer · watch your stack · NVD