[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.
Original description
The description as published by the source.
Cisco Catalyst SD-WAN Manager contains a storing passwords in a recoverable format vulnerability that allows an authenticated, local attacker to gain DCA user privileges by accessing a credential file for the DCA user on the filesystem as a low-privileged user.
AI summary
Written by an external AI model and may contain mistakes. Check the original description and references below before acting on it.
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.
Cisco Catalyst SD-WAN Manager stores passwords in a recoverable format, allowing unauthorized access.
Credential file on the filesystem of Cisco Catalyst SD-WAN Manager.
High severity, allows unauthorized privilege escalation by authenticated local attackers.
Not specified in the current materials.
No specified workaround available.
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
Unauthorized access to sensitive network management credentials and potential network exposure.
Compromised credentials lead to unauthorized configuration changes, affecting network service quality.
Customer network configurations may be exposed, leading to confidentiality breaches.
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
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。 -
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