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CVE-2026-20128
CISA KEV
high
[KEV] Vulnerability in Cisco catalyst-sd-wan-manager (CVE-2026-20128)
Summary
vulnerability in Cisco catalyst-sd-wan-manager (CVE-2026-20128). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
AI summary openai / gpt-4o
A vulnerability in Cisco Catalyst SD-WAN Manager allows attackers to access passwords in a recoverable format, potentially leading to unauthorized network control. Similar to the past Heartbleed incident, where cryptographic flaws were exploited, this vulnerability also underscores the need for prompt security measures. Organizations should apply the latest security patches to safeguard their systems.
The vulnerability in Cisco Catalyst SD-WAN Manager permits authenticated local attackers to gain DCA user privileges by accessing credential files on the filesystem. This is due to passwords being stored in a recoverable format. The fix version is not specified in the current materials, and no workaround has been confirmed. It is recommended to enhance server monitoring to quickly identify abnormal access patterns.
❓ What is the problem
Cisco Catalyst SD-WAN Manager stores passwords in a recoverable format, allowing unauthorized access.
📍 Affected scope
Credential file on the filesystem of Cisco Catalyst SD-WAN Manager.
🔥 Severity
High severity, allows unauthorized privilege escalation by authenticated local attackers.
🔧 How to fix
Not specified in the current materials.
🛡️ Workaround
No specified workaround available.
🔍 Detection
Monitor for unauthorized access attempts on the filesystem looking for credential file accesses.
Related past incidents Similar incidents extracted from past CVEs
A similar vulnerability in another Cisco product where credentials were stored in plain text, leading to unauthorized access.
An example of a vulnerability where sensitive data could be extracted due to cryptographic flaw.
Another Cisco vulnerability involving unauthorized access by exploiting improper access controls.
If this happens at your company Expected impact per business scenario
📌 Corporate network management environment using Cisco Catalyst SD-WAN Manager.
Unauthorized access to sensitive network management credentials and potential network exposure.
📌 Telecommunications company employing SD-WAN for critical operations.
Compromised credentials lead to unauthorized configuration changes, affecting network service quality.
📌 Managed Service Provider (MSP) using SD-WAN solutions for customers.
Customer network configurations may be exposed, leading to confidentiality breaches.
Recommended action
Apply the latest security patches as soon as possible and enhance monitoring of file system accesses to detect and respond to unauthorized credential file access attempts.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'catalyst-sd-wan-manager' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `catalyst-sd-wan-manager` を grep し、稼働しているサービス・バージョンを把握する。
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4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory NVD