CVE•Published 2026-07-13•Modified 2026-08-11•1 article on news•6 live references•NVD data
CVE-2026-51537Opener_project · Opener
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS percentile
37
Exploit Prediction Scoring System · top 63% of all CVEs
Weaknesses (CWE)
Description
EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.
Timeline
Published 2026-07-13
Modified 2026-08-11
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-51537Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Opener Project Opener" version:"2.3.0"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Opener"HTTP body or banner mentions "Opener" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-51537Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-51537Censys host search filtered to this CVE id.
grep.app
CVE-2026-51537Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-51537GitHub code search for direct mentions.
Google dork
"CVE-2026-51537" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-51537 on GitHub.