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CVE-2025-34027— Versa Concerto Authentication Bypass File Write Remote Code Execution

Quick assessment

Affected
Versa Concerto
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Versa Concerto SD-WAN是Versa公司的一个易于使用的用户界面，用于配置和监控安全 SD-WAN 中的 Versa OS设备。 Versa Concerto SD-WAN 12.1.2至12.2.0版本存在安全漏洞，该漏洞源于Traefik反向代理配置中的身份验证绕过，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Moderate EPSS 32.34% · P98

Public Exploits 1

Nuclei · 1 CVE-2025-34027.yaml [template]
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I. Basic Information for CVE-2025-34027

Vulnerability Information
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Vulnerability Title
Versa Concerto Authentication Bypass File Write Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Versa Concerto SD-WAN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Versa Concerto SD-WAN是Versa公司的一个易于使用的用户界面，用于配置和监控安全 SD-WAN 中的 Versa OS设备。 Versa Concerto SD-WAN 12.1.2至12.2.0版本存在安全漏洞，该漏洞源于Traefik反向代理配置中的身份验证绕过，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Versa Concerto 12.1.2 ~ 12.2.0 -

II. Public POCs for CVE-2025-34027

# POC Description Source Link Shenlong Link
1 Authentication bypass in the Versa Concerto API, caused by URL decoding inconsistencies. It allowed unauthorized access to certain API endpoints by manipulating the URL path.This issue enabled attackers to bypass authentication controls and access restricted resources. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34027.yaml POC Details
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III. Intelligence Information for CVE-2025-34027

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Security Blog Posts for CVE-2025-34027 (1)

Same Patch Batch · Versa · 2025-05-21 · 3 CVEs total

CVE-2025-34026 Versa Concerto Actuator Authentication Bypass Information Leak
CVE-2025-34025 Versa Concerto Insecure Docker Mount Container Escape

IV. Related Vulnerabilities

Same product: Concerto
Same vendor: Versa
Same weakness: CWE-367

V. Comments for CVE-2025-34027

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