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CVE-2025-34027

CRITICAL
10.0
CVSS 4.0
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.

Metadata

CVE ID
CVE-2025-34027
State
PUBLISHED
Assigner
VulnCheck
Reserved
2025-04-15 19:15 UTC
Published
2025-05-21 21:58 UTC
Last updated
2026-02-26 18:27 UTC
Primary CWE
CWE-367
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Vendor / Product
Versa / Concerto
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Versa Concerto — 12.1.2 ≤ 12.2.0
Weakness (CWE)
CWESourceDescription
CWE-367 cna CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
References (1)
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