---
cve: "CVE-2026-20331"
severity: "CRITICAL"
cvss: 9.6
epss: "0.2%"
vendor: "Cisco"
kev: false
exploited: false
published: "2026-09-16 17:17:17"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T21:43:45+02:00"
---

# CVE-2026-20331

> 9.6 CRITICAL

## Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.  

The vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Schwachstellen-Klasse

- **CWE-693** — Protection Mechanism Failure
  The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

## Angriffsmuster (CAPEC)

- [CAPEC-1 — Accessing Functionality Not Properly Constrained by ACLs](https://capec.mitre.org/data/definitions/1.html) _(Severity: High)_
- [CAPEC-17 — Using Malicious Files](https://capec.mitre.org/data/definitions/17.html) _(Severity: Very High)_
- [CAPEC-20 — Encryption Brute Forcing](https://capec.mitre.org/data/definitions/20.html) _(Severity: Low)_
- [CAPEC-22 — Exploiting Trust in Client](https://capec.mitre.org/data/definitions/22.html) _(Severity: High)_
- [CAPEC-36 — Using Unpublished Interfaces or Functionality](https://capec.mitre.org/data/definitions/36.html) _(Severity: High)_
- [CAPEC-107 — Cross Site Tracing](https://capec.mitre.org/data/definitions/107.html) _(Severity: Very High)_
- [CAPEC-127 — Directory Indexing](https://capec.mitre.org/data/definitions/127.html) _(Severity: Medium)_
- [CAPEC-237 — Escaping a Sandbox by Calling Code in Another Language](https://capec.mitre.org/data/definitions/237.html) _(Severity: Very High)_

## ATT&CK-Techniken

- [T1574.010 — Hijack Execution Flow: ServicesFile Permissions Weakness](https://attack.mitre.org/techniques/T1574/010/)
- [T1574.005 — Hijack Execution Flow: Executable Installer File Permissions](https://attack.mitre.org/techniques/T1574/005/)
- [T1083 — File and Directory Discovery](https://attack.mitre.org/techniques/T1083/)

## Referenzen

- <https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-20331) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_