Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability
- Severity
- High8.6CVSS 3.1, High
- Known exploited
- Known exploitedFederal remediation due date: 14 Aug 2026
- Exploit prediction
- 1%
- Published
- 11 Aug 2026Updated 16 Sept 2026 · Last verified 30 Sept 2026
Known remediation
Fixed releases per branch, as the vendor states them. Patcharo never infers a fix.
Cisco Secure Firewall ASA
Vendor advisory- 9.24No fix published
- 9.23No fix published
- 9.22No fix published
- 9.20No fix published
- 9.19No fix published
- 9.18No fix published
- 9.16No fix published
Cisco Secure Firewall Threat Defense (FTD)
Vendor advisory- 10.0No fix published
- 7.7No fix published
- 7.6No fix published
- 7.4No fix published
- 7.3No fix published
- 7.2No fix published
- 7.0No fix published
Description
Title, description and vendor guidance are quoted from the source records.
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
Weakness: CWE-244
Known exploited
Added to CISA KEV on 11 Aug 2026
Federal remediation due date: 14 Aug 2026
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Exploit prediction
1% probability of exploitation in the next 30 days (percentile 62%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
What the source states, per branch
Versions matched by Patcharo
Cisco Secure Firewall ASASource: Cisco (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 9.24 | Exact releases: 9.24.1, 9.24.1.5, 9.24.1.9, 9.24.1.155, 9.24.1.11 | |
| 9.23 | Exact releases: 9.23.1, 9.23.1.3, 9.23.1.7, 9.23.1.13, 9.23.1.19, 9.23.1.22, 9.23.1.26, 9.23.1.195, 9.23.1.32 | |
| 9.22 | Exact releases: 9.22.1.1, 9.22.1.3, 9.22.1.2, 9.22.1.6, 9.22.2, 9.22.2.4, 9.22.2.9, 9.22.2.13, 9.22.2.14, 9.22.2.20, 9.22.2.32, 9.22.3, 9.22.3.5 | |
| 9.20 | Exact releases: 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, 9.20.3.4, 9.20.3.7, 9.20.3.9, 9.20.3.10, 9.20.3.13, 9.20.3.16, 9.20.3.20, 9.20.4, 9.20.4.7, 9.20.4.10, 9.20.4.14, 9.20.4.19, 9.20.4.22, 9.20.4.28, 9.20.4.30, 9.20.4.34 | |
| 9.19 | Exact releases: 9.19.1, 9.19.1.5, 9.19.1.9, 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 | |
| 9.18 | Exact releases: 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, 9.18.4.5, 9.18.4.8, 9.18.4.22, 9.18.4.24, 9.18.4.29, 9.18.4.34, 9.18.4.40, 9.18.4.47, 9.18.4.50, 9.18.4.52, 9.18.4.53, 9.18.4.57, 9.18.4.66, 9.18.4.67, 9.18.4.68, 9.18.4.71, 9.18.4.76, 9.18.4.135, 9.18.4.82 | |
| 9.16 | Exact releases: 9.16.1, 9.16.1.28, 9.16.2, 9.16.2.3, 9.16.2.7, 9.16.2.11, 9.16.2.13, 9.16.2.14, 9.16.3.3, 9.16.3, 9.16.3.14, 9.16.3.15, 9.16.3.19, 9.16.3.23, 9.16.4, 9.16.4.9, 9.16.4.14, 9.16.4.18, 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, 9.16.4.85, 9.16.4.89, 9.16.4.92 |
Versions not listed are not assessed (shown as Unknown).
Cisco Secure Firewall Threat Defense (FTD)Source: Cisco (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 10.0 | Exact releases: 10.0, 10.0.2 | |
| 7.7 | Exact releases: 7.7, 7.7.10, 7.7.11, 7.7.10.1 | |
| 7.6 | Exact releases: 7.6, 7.6.1, 7.6.2, 7.6.2.1, 7.6.4 | |
| 7.4 | Exact releases: 7.4, 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, 7.4.3, 7.4.4, 7.4.7 | |
| 7.3 | Exact releases: 7.3, 7.3.1, 7.3.1.1, 7.3.1.2 | |
| 7.2 | Exact releases: 7.2, 7.2.0.1, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.4.1, 7.2.5.1, 7.2.6, 7.2.7, 7.2.5.2, 7.2.8, 7.2.8.1, 7.2.9, 7.2.10, 7.2.10.2, 7.2.11 | |
| 7.0 | Exact releases: 7.0, 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, 7.0.9 |
Versions not listed are not assessed (shown as Unknown).
References
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Cisco (CVE record)
- Cisco (CVE record) · 30 Sept 2026 at 00:17 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 30 Sept 2026 at 00:17 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 28 Sept 2026 at 07:02 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 30 Sept 2026 at 00:17 UTC · Parser patcharo-epss/1.0.0
Last verified: 30 Sept 2026 at 00:17 UTC