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CVE-2026-20357 is a critical missing-authentication vulnerability class in Cisco Crosswork. It represents multiple internally discovered issues addressed in the Crosswork 7.2.1-SP hardening release and is categorized as CWE-306. The flaw class allows critical application functions to be reached without proper authentication checks, resulting in an authentication bypass condition. Cisco groups multiple related issues under this CVE rather than describing a single vulnerable function.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Cisco Crosswork vulnerability grouping multiple issues; one of the flaws fixed in Crosswork 7.2.1-SP that could enable severe impacts such as remote code execution, authentication bypass, path traversal, or file overwrite/deletion.
A critical authentication bypass vulnerability affecting critical functions in Cisco Crosswork.
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.