CVE-2025-34027

CVE-2025-34027 vulnerability

Severity

HIGH

EPSS

36.6%

EPSS pct

98th

Exploited

No known

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.

Affected vendor

See references

Affected product

See references

Weakness type (CWE)

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

Published

2025-05-21

Risk analysis

Its EPSS score of 36.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2025-34027

Confirm whether the affected software is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2025-34027.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-34027

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