# Cisco Patches 35 Vulnerabilities: Critical Flaws in Meraki, NX-OS

> Cisco released patches for 35 vulnerabilities, including multiple critical issues in Meraki, License On-Prem, NX-OS, and APIC products.

- Published: 2026-10-08T20:58:17.000Z
- Severity: high
- Category: Vulnerabilities
- Tags: Cisco, Vulnerability Patching, RCE, Meraki, NX OS
- CVEs: CVE-2026-76464, CVE-2026-20328, CVE-2026-76454, CVE-2026-76482, CVE-2026-76480, CVE-2026-76483, CVE-2026-76455, CVE-2026-76459, CVE-2026-76471, CVE-2026-76465, CVE-2026-76485, CVE-2026-76486, CVE-2026-76501, CVE-2026-76498, CVE-2026-76499, CVE-2026-76500, CVE-2026-20362
- Author: Runtime Rebel Intel
- Primary source: https://www.securityweek.com/cisco-patches-a-dozen-critical-vulnerabilities/
- Canonical: https://runtimerebel.com/blog/cisco-patches-35-vulnerabilities-critical-flaws-in-meraki-nx-os

## Key points

- Immediate impact: Multiple Cisco products are vulnerable to critical flaws that could lead to unauthorized access or remote code execution.
- Affected systems: Cisco Meraki, License On-Prem, NX-OS, APIC, and Finesse contain various security vulnerabilities.
- Recommended remediation: Apply all available Cisco security patches and updates immediately to mitigate risks.

## Cisco Addresses 35 Vulnerabilities Across Key Products

Cisco has released patches for 35 vulnerabilities impacting a wide range of its products, including critical-severity issues in Meraki, License On-Prem, NX-OS, and Application Policy Infrastructure Controller (APIC) as reported by [SecurityWeek](https://www.securityweek.com/cisco-patches-a-dozen-critical-vulnerabilities/). While Cisco is not aware of any in-the-wild exploitation for these vulnerabilities, the widespread impact and the potential for severe consequences—including remote code execution and unauthorized access—underscore the immediate need for security professionals to apply these updates. This comprehensive patching effort highlights Cisco's commitment to product security and provides essential fixes for potential attack vectors across enterprise networks.

### Technical Details of Critical Cisco Vulnerabilities

The [patch](/glossary#patch) bundle addresses over a dozen critical-severity vulnerabilities. These flaws could be exploited to compromise systems, escalate privileges, or cause denial-of-service conditions, often without requiring authentication.

#### Cisco Meraki Security [Hardening](/glossary#hardening) Release
A significant portion of the patches pertains to a **Cisco Meraki security hardening** release, resolving multiple bugs grouped under seven CVEs. The most severe of these is [CVE-2026-76464](https://nvd.nist.gov/vuln/detail/CVE-2026-76464), which covers memory-related issues such as buffer overflows and out-of-bounds writes. Such vulnerabilities can often lead to arbitrary code execution if successfully exploited, posing a direct threat to the integrity and availability of Meraki-managed networks.

#### Critical Flaws in Cisco License On-Prem
Cisco also resolved eight bugs in its License On-Prem product, with five designated as critical-severity issues. Two of these, [CVE-2026-20328](https://nvd.nist.gov/vuln/detail/CVE-2026-20328) and [CVE-2026-76454](https://nvd.nist.gov/vuln/detail/CVE-2026-76454), are particularly concerning as they could lead to unauthorized access and Denial of Service ([DoS](/glossary#dos)) conditions, respectively, and can be exploited without authentication. The remaining three critical CVEs—[CVE-2026-76482](https://nvd.nist.gov/vuln/detail/CVE-2026-76482), [CVE-2026-76480](https://nvd.nist.gov/vuln/detail/CVE-2026-76480), and [CVE-2026-76483](https://nvd.nist.gov/vuln/detail/CVE-2026-76483)—address multiple security holes related to missing authentication, improper verification of cryptographic signatures, and insufficiently protected credentials. For organizations seeking to prevent **Cisco License On-Prem unauthorized access**, applying these patches is paramount.

#### NX-OS Remote Code Execution and DoS Vulnerabilities
Cisco's NX-OS received fixes for 14 vulnerabilities, including seven critical-severity issues. Among these, improper [access control](/glossary#access-control) and out-of-bounds write flaws are grouped under [CVE-2026-76455](https://nvd.nist.gov/vuln/detail/CVE-2026-76455) and [CVE-2026-76459](https://nvd.nist.gov/vuln/detail/CVE-2026-76459). Of greater concern are [CVE-2026-76471](https://nvd.nist.gov/vuln/detail/CVE-2026-76471) and [CVE-2026-76465](https://nvd.nist.gov/vuln/detail/CVE-2026-76465), which could enable remote, unauthenticated attackers to execute arbitrary code with root privileges or cause a DoS condition. These constitute a direct **NX-OS remote code execution [vulnerability](/glossary#vulnerability)** threat. Three additional issues ([CVE-2026-76485](https://nvd.nist.gov/vuln/detail/CVE-2026-76485), [CVE-2026-76486](https://nvd.nist.gov/vuln/detail/CVE-2026-76486), and [CVE-2026-76501](https://nvd.nist.gov/vuln/detail/CVE-2026-76501)) specifically affect Nexus 3000 and Nexus 9000 series switches when Next Generation OAM (NGOAM) is enabled.

#### Application Policy Infrastructure Controller (APIC) and Finesse
Three critical-severity CVEs ([CVE-2026-76498](https://nvd.nist.gov/vuln/detail/CVE-2026-76498), [CVE-2026-76499](https://nvd.nist.gov/vuln/detail/CVE-2026-76499), and [CVE-2026-76500](https://nvd.nist.gov/vuln/detail/CVE-2026-76500)) were patched in Cisco's Application Policy Infrastructure Controller (APIC). These vulnerabilities cover improper access control, OS injection, and memory flaws. For administrators focused on **mitigation for Cisco APIC improper access control**, these updates are essential to prevent unauthorized command execution or data manipulation.
Additionally, Cisco Finesse received updates addressing a high-severity Server-Side Request Forgery ([SSRF](/glossary#ssrf)) flaw, [CVE-2026-20362](https://nvd.nist.gov/vuln/detail/CVE-2026-20362), which had been publicly disclosed prior to the patch release.

### Actionable Recommendations and Mitigations

Given the breadth and severity of these vulnerabilities, security teams must prioritize patching efforts across their Cisco environments.

*   **Immediate Patch Deployment:** Deploy all relevant Cisco security updates and advisories immediately. This includes patches for Meraki, License On-Prem, NX-OS, APIC, and Finesse. Refer to Cisco's official security advisories for specific update paths.
*   **System Inventory and Dependency Mapping:** Maintain an accurate inventory of all Cisco devices and software, noting versions and configurations. This helps identify affected systems quickly and ensures no component is overlooked during patching cycles.
*   **[Network Segmentation](/glossary#network-segmentation):** Implement or review network segmentation strategies to limit the [blast radius](/glossary#blast-radius) of potential exploits. Even if a system is compromised, proper segmentation can prevent attackers from moving laterally to other critical assets.
*   **Monitor for Anomalous Activity:** While Cisco is not aware of in-the-wild exploitation, vigilance is key. Monitor network traffic and system logs for any indicators of compromise (IoCs) or unusual behavior that might suggest attempted or successful exploitation of these vulnerabilities.
*   **Disable Unnecessary Features:** For affected Nexus 3000 and 9000 series switches, consider disabling Next Generation OAM (NGOAM) if it is not a required service, as this reduces the [attack surface](/glossary#attack-surface) for [CVE](/glossary#cve)-2026-76485, CVE-2026-76486, and CVE-2026-76501.
*   **Regular Vulnerability Scanning:** Incorporate regular vulnerability scanning into your security program to identify unpatched systems or misconfigurations that could expose your environment to known threats.

Proactive patching and a layered security approach are crucial to defend against these and future threats. Organizations should treat these advisories with urgency, ensuring their Cisco infrastructure remains secure against potential attacks.

**Related:** [CVE-2026-66066: Unauthenticated File Read in Rails Active Storage](/blog/cve-2026-66066-unauthenticated-file-read-in-rails-active-storage), [Cursor RCE via Malicious Git Executable — Unpatched Vulnerability Alert](/blog/cursor-rce-via-malicious-git-executable-unpatched-vulnerability-alert)

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