CVE-2026-20106

MEDIUM

5.3

CVSS Score

Published: March 4, 2026 at 05:19 PM UTC

Updated: August 11, 2026 at 07:58 PM UTC

2 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat Defense

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A vulnerability in the Remote Access SSL VPN, HTTP management and MUS functionality, of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition requiring a manual reboot. This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to stop responding, resulting in a DoS condition.

Affected

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

Adaptive Security Appliance · Cisco

95%

9.12.1 ≤ v < 9.16.4.859.17.1 ≤ v < 9.18.4.669.19.1 ≤ v < 9.20.49.22.1.1 ≤ v < 9.22.2.49.23.1 ≤ v < 9.23.1.79.12.1 9.12.1.2 9.12.1.3 9.12.2 9.12.2.1 9.12.2.4 9.12.2.5 9.12.2.9 9.12.3 9.12.3.12 9.12.3.2 9.12.3.7 9.12.3.9 9.12.4 9.12.4.10 9.12.4.13 9.12.4.18 9.12.4.2 9.12.4.24 9.12.4.26 9.12.4.29 9.12.4.30 9.12.4.35 9.12.4.37 9.12.4.38 9.12.4.39 9.12.4.4 9.12.4.40 9.12.4.41 9.12.4.47 9.12.4.48 9.12.4.50 9.12.4.52 9.12.4.54 9.12.4.55 9.12.4.56 9.12.4.58 9.12.4.62 9.12.4.65 9.12.4.67 9.12.4.7 9.12.4.8 9.16.1 9.16.1.28 9.16.2 9.16.2.11 9.16.2.13 9.16.2.14 9.16.2.3 9.16.2.7 9.16.3 9.16.3.14 9.16.3.15 9.16.3.19 9.16.3.23 9.16.3.3 9.16.4 9.16.4.14 9.16.4.19 9.16.4.27 9.16.4.38 9.16.4.39 9.16.4.42 9.16.4.48 9.16.4.55 9.16.4.57 9.16.4.61 9.16.4.62 9.16.4.67 9.16.4.70 9.16.4.71 9.16.4.76 9.16.4.82 9.16.4.84 9.16.4.9 9.17.1 9.17.1.10 9.17.1.11 9.17.1.13 9.17.1.15 9.17.1.20 9.17.1.30 9.17.1.33 9.17.1.39 9.17.1.45 9.17.1.46 9.17.1.7 9.17.1.9 9.18.1 9.18.1.3 9.18.2 9.18.2.5 9.18.2.7 9.18.2.8 9.18.3 9.18.3.39 9.18.3.46 9.18.3.53 9.18.3.55 9.18.3.56 9.18.4 9.18.4.22 9.18.4.24 9.18.4.29 9.18.4.34 9.18.4.40 9.18.4.47 9.18.4.5 9.18.4.50 9.18.4.52 9.18.4.53 9.18.4.57 9.18.4.8 9.19.1 9.19.1.12 9.19.1.18 9.19.1.22 9.19.1.24 9.19.1.27 9.19.1.28 9.19.1.31 9.19.1.37 9.19.1.38 9.19.1.42 9.19.1.5 9.19.1.9 9.20.1 9.20.1.5 9.20.2 9.20.2.10 9.20.2.21 9.20.2.22 9.20.3 9.20.3.10 9.20.3.13 9.20.3.16 9.20.3.20 9.20.3.4 9.20.3.7 9.20.3.9 9.22.1.1 9.22.1.2 9.22.1.3 9.22.1.6 9.22.2 9.23.1 9.23.1.3

Affected range stops below 9.16.4.85, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.18.4.66, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.20.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.22.2.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.23.1.7, so it looks safe — our inference, not a vendor statement

Secure Firewall Threat Defense · Cisco

95%

6.4.0 ≤ v < 7.0.97.1.0 ≤ v < 7.2.117.3.0 ≤ v < 7.4.37.6.0 ≤ v < 7.6.47.7.0 ≤ v < 7.7.116.4.0 6.4.0.1 6.4.0.10 6.4.0.11 6.4.0.12 6.4.0.13 6.4.0.14 6.4.0.15 6.4.0.16 6.4.0.17 6.4.0.18 6.4.0.2 6.4.0.3 6.4.0.4 6.4.0.5 6.4.0.6 6.4.0.7 6.4.0.8 6.4.0.9 7.0.0 7.0.0.1 7.0.1 7.0.1.1 7.0.2 7.0.2.1 7.0.3 7.0.4 7.0.5 7.0.6 7.0.6.1 7.0.6.2 7.0.6.3 7.0.7 7.0.8 7.0.8.1 7.1.0 7.1.0.1 7.1.0.2 7.1.0.3 7.2.0 7.2.0.1 7.2.1 7.2.10 7.2.10.2 7.2.2 7.2.3 7.2.4 7.2.4.1 7.2.5 7.2.5.1 7.2.5.2 7.2.6 7.2.7 7.2.8 7.2.8.1 7.2.9 7.3.0 7.3.1 7.3.1.1 7.3.1.2 7.4.0 7.4.1 7.4.1.1 7.4.2 7.4.2.1 7.4.2.2 7.4.2.3 7.4.2.4 7.6.0 7.6.1 7.6.2 7.6.2.1 7.7.0 7.7.10 7.7.10.1

Affected range stops below 7.0.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.2.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.6.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.7.11, 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

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

References (1)

Vendor Advisory

Source: cverecord

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.3MEDIUMcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-401

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