Read the docs
TI-2025-24196 Aliases CVE-2025-34027GHSA-96gf-3rqf-c8m9

Versa Concerto Authentication Bypass File Write Remote Code Execution

Priority HIGH 79CWE-367Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.46402 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
VersaConcerto12.1.2 – 12.2.0—No fix listedCNA
  • Concerto VendorVersa Affected 12.1.2 – 12.2.0 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:*11.4.0 – 12.1.1VulnerableVersa
cpe:2.3:a:versa-networks:concerto:12.1.2:-:*:*:*:*:*:*12.1.2VulnerableVersa
cpe:2.3:a:versa-networks:concerto:12.2.1:-:*:*:*:*:*:*12.2.1VulnerableVersa
  • cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:* Versions 11.4.0 – 12.1.1 Vulnerable ·Versa
  • cpe:2.3:a:versa-networks:concerto:12.1.2:-:*:*:*:*:*:* Versions 12.1.2 Vulnerable ·Versa
  • cpe:2.3:a:versa-networks:concerto:12.2.1:-:*:*:*:*:*:* Versions 12.2.1 Vulnerable ·Versa

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-34027
  2. 2026-10-03 Alias added: GHSA-96gf-3rqf-c8m9

References

Exploit 1

  • TI-2025-24195 Versa Concerto Actuator Authentication Bypass Information Leak KEVCVSS 4.0CRITICAL 9.2
  • TI-2025-24194 Versa Concerto Insecure Docker Mount Container Escape CVSS 4.0HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences