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CVE-2020-3578

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN Portal Access Rule Bypass Vulnerability

MEDIUM
6.5
CVSS Score
Published: October 21, 2020 at 06:40 PM UTC
Updated: August 11, 2026 at 07:42 PM UTC
3 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat DefenseFirepower Threat Defense

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access rule and access parts of the WebVPN portal that are supposed to be blocked. The vulnerability is due to insufficient validation of URLs when portal access rules are configured. An attacker could exploit this vulnerability by accessing certain URLs on the affected device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Adaptive Security Appliance· Cisco
95%
v < 9.6.4.459.10 ≤ v < 9.10.1.449.12 ≤ v < 9.12.4.49.13 ≤ v < 9.13.1.139.14 ≤ v < 9.14.1.199.7 ≤ v < 9.8.4.269.9 ≤ v < 9.9.2.80
Affected range stops below 9.10.1.44, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.12.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.13.1.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.14.1.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.6.4.45, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.8.4.26, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.9.2.80, so it looks safe — our inference, not a vendor statement
Firepower Threat Defense· Cisco
95%
v < 6.3.0.66.5.0 ≤ v < 6.5.0.56.6.0 ≤ v < 6.6.1
Affected range stops below 6.3.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5.0.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.6.1, so it looks safe — our inference, not a vendor statement
Secure Firewall Threat Defense· Cisco
95%
6.4.0 ≤ v < 6.4.0.10
Affected range stops below 6.4.0.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCOPatch
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-P73ABNWQ

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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