CVE-2019-1884 Cisco Web Security Appliance Web Proxy Denial of Service Vulnerability
An authenticated remote attacker can cause a denial of service on Cisco Web Security Appliance by sending malicious HTTP/HTTPS requests due to insufficient input validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1884?
CVE-2019-1884 is a high-severity denial of service vulnerability in Cisco Asyncos, published on 4 Jul 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation mechanisms for certain fields in HTTP/HTTPS requests sent through an affected device. A successful attacker could exploit this vulnerability by sending a malicious HTTP/HTTPS request through an affected device. An exploit could allow the attacker to force the device to stop processing traffic, resulting in a DoS condition.
Weakness: CWE-20
Which versions are affected by CVE-2019-1884?
It affects 2 products.
Products include Cisco Asyncos, Cisco Web Security Appliance.
How do I fix CVE-2019-1884?
No fix has been published for CVE-2019-1884 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-1884 being exploited?
There is no known exploitation of CVE-2019-1884 in the wild and no public exploit code.
Other vulnerabilities in Cisco Asyncos
- CVE-2025-20393 Cisco Multiple Products Improper Input Validation
- CVE-2026-76519 Cisco Secure Email Gateway Relative Path Traversal
- CVE-2026-76461 Cisco Secure Email Gateway SQL Injection
- CVE-2024-20435 Command injection in Cisco Secure Web Appliance
- CVE-2019-15956 Cisco Web Security Appliance Unauthorized Device Reset Vulnerability
Sources
Also known as GHSA-jpm3-6rm2-fhgg.