CVE-2025-20183 — MEDIUM (5.8)

Vulnerability Description

A vulnerability in a policy-based Cisco Application Visibility and Control (AVC) implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to evade the antivirus scanner and download a malicious file onto an endpoint.  The vulnerability is due to improper handling of a crafted range request header. An attacker could exploit this vulnerability by sending an HTTP request with a crafted range request header through the affected device. A successful exploit could allow the attacker to evade the antivirus scanner and download malware onto the endpoint without detection by Cisco Secure Web Appliance.

CVSS Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Cisco	Asyncos	11.8.0-414
Cisco	Secure Web Appliance Virtual S1000V	-
Cisco	Secure Web Appliance Virtual S100V	-
Cisco	Secure Web Appliance Virtual S300V	-
Cisco	Secure Web Appliance Virtual S600V	-
Cisco	Secure Web Appliance S196	-
Cisco	Secure Web Appliance S396	-
Cisco	Secure Web Appliance S696	-

Related Weaknesses (CWE)

CWE-20

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ciVendor Advisory

FAQ

What is CVE-2025-20183?

CVE-2025-20183 is a vulnerability with a CVSS score of 5.8 (MEDIUM). A vulnerability in a policy-based Cisco Application Visibility and Control (AVC) implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker...

How severe is CVE-2025-20183?

CVE-2025-20183 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-20183?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Asyncos, Cisco Secure Web Appliance Virtual S1000V, Cisco Secure Web Appliance Virtual S100V, Cisco Secure Web Appliance Virtual S300V, Cisco Secure Web Appliance Virtual S600V.