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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)
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
VendorProductAffected VersionsCPESubscribe
VersaConcerto 12.1.2 ~ 12.2.0 -
II. Public POCs for CVE-2025-34027
#POC DescriptionSource LinkShenlong Link
1Authentication 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.yamlPOC Details
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III. Intelligence Information for CVE-2025-34027
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IV. Related Vulnerabilities
Same product: Concerto
Same vendor: Versa
Same weakness: CWE-367
V. Comments for CVE-2025-34027

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