CVE-2026-20331

CRITICAL

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 Secur...

Affects 0 products across 1 vendor.

CVSS 3.19.6
EPSS0.2%
Percentile12th
PatchUnknown
CVSS Vector — Plain English Exploitable from adjacent network, low complexity, no authentication required, no user interaction needed, can impact systems beyond the vulnerable component, full confidentiality impact, full integrity impact.
CWE Weakness Definitions
CWE-693: CWE-693
Related Attack Patterns (CAPEC)
CAPEC-51 Poison Web Service Registry
via CWE-693
CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
via CWE-693
CAPEC-59 Session Credential Falsification through Prediction
via CWE-693
CAPEC-65 Sniff Application Code
via CWE-693
CAPEC-107 Cross Site Tracing
via CWE-693
Show all 17

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-20331) affects the target system. 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 tea...

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Frequently Asked Questions
What is CVE-2026-20331?
A critical severity vulnerability (CVE-2026-20331) affects the target system. 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 tea...
What is the CVSS score for CVE-2026-20331?
CVE-2026-20331 has CVSS 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L. EPSS: 0.2%.
Is CVE-2026-20331 actively exploited?
No confirmed active exploitation of CVE-2026-20331 as of 2026-09-25.
How do I remediate CVE-2026-20331?
Apply vendor patches for CVE-2026-20331. Monitor Cisco advisories.
What systems are affected by CVE-2026-20331?
CVE-2026-20331 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20331
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Published2026-09-16
Last Modified2026-09-18
ICS Relevance65%
Weakness (CWE)
CWE-693
SourceNVD
Official Description

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.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductFixed Version
Cisco — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: September 2026 | Threat Age: 11 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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