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CVE-2026-20358 is a critical vulnerability in Cisco Crosswork caused by external control of file system operations. The issue groups multiple internally discovered file-system-related weaknesses under CWE-73 and was addressed in the Cisco Crosswork 7.2.1-SP hardening release. The vulnerability class indicates that attacker-controlled input can improperly influence file system access or manipulation, enabling unsafe handling of files or paths within the application. Reported exploitation outcomes associated with this flaw include path traversal and unauthorized file overwrite or deletion, and Cisco characterized the issue as critical with a CVSS score of 10.0.
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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.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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 vulnerability in Cisco Crosswork that can allow attackers to gain control over the file system.
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.