HighCISA KEVExploited in the wildPublic exploit

Information Disclosure in Cisco Catalyst SD-WAN Manager vshell

IdentifiersCVE-2026-20133CWE-552

CVE-2026-20133 is an information disclosure vulnerability in Cisco Catalyst SD-WAN Software / Catalyst SD-WAN Manager. According to the provided content, the issue is caused by insufficient file system restrictions. An attacker who has access to the vshell on an affected system can exploit the weakness to read sensitive information from the underlying operating system. The content is internally inconsistent on whether exploitation is unauthenticated or requires privileges; the more specific description states exploitation requires access to the vshell by an authenticated attacker with netadmin privileges. Cisco and multiple reports also indicate this vulnerability has been observed exploited in the wild in 2026, including as part of broader SD-WAN exploitation chains.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows disclosure of sensitive information resident on the underlying operating system of the affected SD-WAN Manager system. This can expose configuration data, credentials, keys, or other operationally sensitive files depending on file accessibility from vshell, and may materially assist follow-on compromise, privilege escalation, or lateral movement when used in a chained attack.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, minimize exposure to the management plane and tightly restrict access to SD-WAN Manager administrative interfaces and vshell. Limit access to trusted management networks only, reduce or eliminate direct internet exposure, enforce least privilege for administrative roles such as netadmin, and monitor for anomalous shell access and suspicious file access on affected systems. Preserve logs and forensic artifacts before making major changes if compromise is suspected.

Remediation

Patch, then assume compromise.

Upgrade Cisco Catalyst SD-WAN Manager / SD-WAN Software to a Cisco-fixed release as specified in Cisco’s February 2026 security updates and the applicable Cisco upgrade matrix. Because the vulnerability has been reported as actively exploited, remediation should be prioritized and accompanied by compromise assessment and review of Cisco/Talos indicators of compromise where available.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Cisco SystemsCatalyst SD-WAN Managerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

65 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

65 SOURCESView more in app

security affairsNews

Jun 16, 2026

CVE-2026-20262: CISCO Catalyst SD-WAN Flaw Under Active Targeted Exploitation

A Cisco SD-WAN vulnerability mentioned as one of several other vulnerabilities discovered this year.

security weekNews

Jun 16, 2026

Cisco Patches Another SD-WAN Zero-Day Exploited in Attacks - SecurityWeek

A Cisco SD-WAN vulnerability listed by the article as having detected exploitation in 2026.

the hacker newsNews

Jun 16, 2026

Cisco Releases Security Updates for Actively Exploited SD-WAN Manager Flaw

A previously flagged actively exploited Cisco SD-WAN vulnerability referenced for context only.

cyberthroneNews

Jun 16, 2026

CISA adds Cisco SD-WAN and LiteSpeed cPanel to KEV - TheCyberThrone

A Cisco SD-WAN vulnerability referenced as a prior 2026 KEV entry.

+30 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence2

Every observed campaign linking this CVE to a named adversary.

Associated malware28

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity26

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-20133

NVD

nvd.nist.gov/vuln/detail/CVE-2026-20133

MITRE CWE · CWE-552

cwe.mitre.org

Vendor Advisory

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v

US Government Resource

cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20133