Information Disclosure in Cisco Catalyst SD-WAN Manager DCA
CVE-2026-20128 is an information disclosure vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager. The issue is caused by the presence of a credential file for the DCA user on an affected system that can be read via a crafted HTTP request. An unauthenticated remote attacker can exploit the flaw to retrieve the file containing the DCA password from an affected system. Cisco states that a successful exploit could then allow the attacker to access another affected system and obtain DCA user privileges. Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
93 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco SD-WAN vulnerability mentioned as one of several other vulnerabilities discovered this year.
A Cisco SD-WAN vulnerability listed by the article as having detected exploitation in 2026.
A previously flagged actively exploited Cisco SD-WAN vulnerability referenced for context only.
A Cisco Catalyst SD-WAN Manager vulnerability identified as one of two information disclosure flaws in a group of vulnerabilities the article says attackers have been exploiting as zero- or n-days.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.