CVE-2019-1851 Cisco Identity Services Engine Arbitrary Client Certificate Creation Vulnerability
Authenticated attackers can exploit RBAC flaws in the ERS API to generate trusted certificates, enabling unauthorized access to protected networks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1851?
CVE-2019-1851 is a medium-severity missing authorization vulnerability in Cisco Identity Services Engine, published on 16 May 2019. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability in the External RESTful Services (ERS) API of the Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker to generate arbitrary certificates signed by the Internal Certificate Authority (CA) Services on ISE. This vulnerability is due to an incorrect implementation of role-based access control (RBAC). An attacker could exploit this vulnerability by crafting a specific HTTP request with administrative credentials. A successful exploit could allow the attacker to generate a certificate that is signed and trusted by the ISE CA with arbitrary attributes. The attacker could use this certificate to access other networks or assets that are protected by certificate authentication.
Weakness: CWE-285
Which versions are affected by CVE-2019-1851?
It affects 1 product.
Products include Cisco Identity Services Engine.
How do I fix CVE-2019-1851?
No fix has been published for CVE-2019-1851 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2019-1851 being exploited?
There is no known exploitation of CVE-2019-1851 in the wild and no public exploit code.
Other vulnerabilities in Cisco Identity Services Engine
- CVE-2026-76460 Cisco Identity Services Engine Incorrect Use of Privileged APIs
- CVE-2025-20337 Cisco Identity Services Engine Injection
- CVE-2025-20281 Cisco Identity Services Engine Injection
- CVE-2026-20130 Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities
- CVE-2026-20192 Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities
Sources
Also known as GHSA-6wxc-vxm7-4wrp.