CVE-2026-20250

HIGH

A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure ...

Affects 0 products across 1 vendor.

CVSS 3.18.6
EPSS0.5%
Percentile44th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, can impact systems beyond the vulnerable component, no confidentiality impact, no integrity impact, full availability impact.
CWE Weakness Definitions
CWE-772: CWE-772
Related Attack Patterns (CAPEC)
CAPEC-469 HTTP DoS
via CWE-772

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

◆ AI Analysis — automated analysis, not human-reviewed

A high severity vulnerability (CVE-2026-20250) affects the target system. A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could al...

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Frequently Asked Questions
What is CVE-2026-20250?
A high severity vulnerability (CVE-2026-20250) affects the target system. A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could al...
What is the CVSS score for CVE-2026-20250?
CVE-2026-20250 has CVSS 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H. EPSS: 0.5%.
Is CVE-2026-20250 actively exploited?
No confirmed active exploitation of CVE-2026-20250 as of 2026-09-25.
How do I remediate CVE-2026-20250?
Apply vendor patches for CVE-2026-20250. Monitor Cisco advisories.
What systems are affected by CVE-2026-20250?
CVE-2026-20250 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20250
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published2026-09-16
Last Modified2026-09-18
ICS Relevance65%
Weakness (CWE)
CWE-772
SourceNVD
Official Description

A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when processing certain DTLS messages. An attacker could exploit this vulnerability by sending a crafted stream of DTLS traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

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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