CVE-2026-20293

HIGH

A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials f...

Affects 0 products across 1 vendor.

CVSS 3.17.1
EPSS0.2%
Percentile4th
PatchUnknown
CVSS Vector — Plain English Requires local access, low complexity, low privileges required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, no availability impact.
CWE Weakness Definitions
CWE-749: CWE-749
Related Attack Patterns (CAPEC)
CAPEC-500 WebView Injection
via CWE-749

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

◆ AI Analysis — automated analysis, not human-reviewed

A high severity vulnerability (CVE-2026-20293) affects the target system. A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin&nbsp...

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Frequently Asked Questions
What is CVE-2026-20293?
A high severity vulnerability (CVE-2026-20293) affects the target system. A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin&nbsp...
What is the CVSS score for CVE-2026-20293?
CVE-2026-20293 has CVSS 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. EPSS: 0.2%.
Is CVE-2026-20293 actively exploited?
No confirmed active exploitation of CVE-2026-20293 as of 2026-09-25.
How do I remediate CVE-2026-20293?
Apply vendor patches for CVE-2026-20293. Monitor Cisco advisories.
What systems are affected by CVE-2026-20293?
CVE-2026-20293 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20293
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published2026-09-08
Last Modified2026-09-11
ICS Relevance55%
Weakness (CWE)
CWE-749
SourceNVD
Official Description

A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software. This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.

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: 19 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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