# Cisco Catalyst SD-WAN Manager CVE-2023-20252 — Mitigation Guide

> Cisco warns of active exploitation targeting Catalyst SD-WAN Manager vulnerabilities CVE-2023-20252 and CVE-2023-20253. Immediate patching is required.

- Published: 2026-03-05T12:19:33.000Z
- Severity: critical
- Category: Vulnerabilities
- Tags: Cisco, SD WAN, CVE-2023-20252, CVE-2023-20253, Active Exploitation
- Author: Runtime Rebel Intel
- Primary source: https://www.bleepingcomputer.com/news/security/cisco-flags-more-sd-wan-flaws-as-actively-exploited-in-attacks/
- Canonical: https://runtimerebel.com/blog/cisco-catalyst-sd-wan-manager-cve-2023-20252-mitigation-guide

## Key points

- Attackers are actively exploiting security flaws in Cisco Catalyst SD-WAN Manager to gain unauthorized access and escalate privileges.
- Affected systems include Cisco Catalyst SD-WAN Manager software versions prior to the fixed releases 20.6.3.4, 20.6.4.2, 20.6.5.5, and 20.9.x.
- Administrators must immediately upgrade vulnerable Cisco Catalyst SD-WAN Manager instances to the recommended software versions to mitigate active threats.

Cisco has officially acknowledged that threat actors are actively exploiting two security vulnerabilities within its Catalyst SD-WAN Manager platform. According to [Bleeping Computer](https://www.bleepingcomputer.com/news/security/cisco-flags-more-sd-wan-flaws-as-actively-exploited-in-attacks/), these flaws, originally patched in mid-2023, have now been observed in malicious activity. This development necessitates an immediate review of [CVE](/glossary#cve) management protocols for organizations utilizing Cisco software-defined networking solutions.

The most severe of these flaws is [CVE-2023-20252](https://nvd.nist.gov/vuln/detail/CVE-2023-20252), which carries a [CVSS](/glossary#cvss) score of 9.8. This vulnerability allows an unauthenticated, remote attacker to gain unauthorized access to the application management interface. By sending crafted requests to the Security Assertion Markup Language (SAML) endpoint, an attacker can bypass authentication and obtain administrative access. In a production environment, this level of access effectively permits [Privilege Escalation](/glossary#privilege-escalation) across the entire SD-WAN fabric.

## Technical Analysis of Active Exploitation

The second vulnerability being targeted is [CVE-2023-20253](https://nvd.nist.gov/vuln/detail/CVE-2023-20253). This flaw resides in the command-line interface (CLI) of the Cisco Catalyst SD-WAN Manager. It allows an authenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system. While this requires initial authentication, the previous bypass provided by CVE-2023-20252 creates a direct path for attackers to gain the necessary credentials.

When these vulnerabilities are chained together, a remote attacker can achieve full control over the SD-WAN infrastructure. This control facilitates [Lateral Movement](/glossary#lateral-movement) within the internal network, as the SD-WAN orchestrator often maintains connections to numerous branch offices and data centers. Security teams are currently investigating [IoC](/glossary#ioc) sets associated with these attacks, though Cisco has not yet publicly attributed the activity to a specific [APT](/glossary#apt).

### Best Practices: How to Detect CVE-2023-20252 Exploit

The impact of a successful exploit on the Catalyst SD-WAN Manager is severe. Because this platform serves as the central orchestration point for network routing and security policies, a compromise allows attackers to intercept traffic, modify firewall rules, and establish [C2](/glossary#c2) channels that are difficult to detect using traditional perimeter defenses. Defenders should prioritize understanding **how to detect CVE-2023-20252 exploit** attempts by monitoring web server logs for unusual SAML assertions and unexpected administrative logins originating from external IP addresses.

Furthermore, the ability to **remediate Cisco SD-WAN information disclosure flaws** and command execution risks depends on the rapid deployment of updated software. The affected software versions include all Cisco Catalyst SD-WAN Manager releases prior to the fixes provided in versions 20.6.3.4, 20.6.4.2, 20.6.5.5, and 20.9.x.

## Mitigation and Defense Strategies

To protect critical infrastructure, organizations must verify their current firmware levels and apply the necessary **Cisco Catalyst SD-WAN Manager security patches** immediately. Cisco has confirmed that there are no workarounds for these vulnerabilities; patching is the only viable defense. Security personnel should follow these steps:

1. Audit all SD-WAN Manager instances to identify versions prior to the 20.6.x or 20.9.x hardened releases.
2. Review [SIEM](/glossary#siem) logs for signs of [Zero-Day](/glossary#zero-day) style exploitation, focusing on authentication bypass patterns.
3. Engage the [SOC](/glossary#soc) to implement [EDR](/glossary#edr) monitoring on the underlying hosts if possible.
4. Validate that management interfaces are not exposed directly to the public internet, using VPNs or restricted jump hosts instead.

These vulnerabilities demonstrate the ongoing interest threat actors have in network management infrastructure. By targeting the SD-WAN controller, attackers bypass traditional [Phishing](/glossary#phishing) or endpoint-based entry methods, moving directly to the core of the enterprise network architecture.

**Related:** [Cisco SD-WAN Zero-Day CVE-2026-20127 Exploited for Admin Access](/blog/cisco-sd-wan-zero-day-cve-2026-20127-exploited-for-admin-access), [CISA Alert: CVE-2026-25108 Soliton FileZen OS Command Injection Exploited](/blog/cisa-alert-cve-2026-25108-soliton-filezen-os-command-injection-exploited)

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