CVE-2026-20336

HIGH

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 3.18.8
EPSS0.2%
Percentile9th
PatchUnknown
CVSS Vector — Plain English Exploitable from adjacent network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-664: CWE-664
Related Attack Patterns (CAPEC)
CAPEC-60 Reusing Session IDs (aka Session Replay)
via CWE-664
CAPEC-61 Session Fixation
via CWE-664
CAPEC-62 Cross Site Request Forgery
via CWE-664
CAPEC-196 Session Credential Falsification through Forging
via CWE-664
CAPEC-21 Exploitation of Trusted Identifiers
via CWE-664

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

◆ AI Analysis — automated analysis, not human-reviewed

A high severity vulnerability (CVE-2026-20336) 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-2026-20336?
A high severity vulnerability (CVE-2026-20336) 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-2026-20336?
CVE-2026-20336 has CVSS 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 0.2%.
Is CVE-2026-20336 actively exploited?
No confirmed active exploitation of CVE-2026-20336 as of 2026-10-06.
How do I remediate CVE-2026-20336?
Apply vendor patches for CVE-2026-20336. Monitor Cisco advisories.
What systems are affected by CVE-2026-20336?
CVE-2026-20336 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20336
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-09-16
Last Modified2026-09-18
ICS Relevance65%
Weakness (CWE)
CWE-664
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-2026-20336 are related to issues concerning improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Cisco — —
Remediation

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

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 19 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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