CVE•Published 2026-08-05•Modified 2026-08-26•1 article on news•5 live references•NVD data
CVE-2026-71263
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:N/I:H/A:H
EPSS percentile
20
Exploit Prediction Scoring System · top 80% of all CVEs
Weaknesses (CWE)
Description
The LINUXTCP port of FreeModbus contains an off-by-one bounds check in xMBPortTCPPool (demo/LINUXTCP/port/porttcp.c). The check uses a strict greater-than comparison instead of greater-than-or-equal against the 263-byte MB_TCP_BUF_SIZE limit.
Timeline
Published 2026-08-05
Modified 2026-08-26
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).
More intel sources (5)
Shodan report
vuln:CVE-2026-71263Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-71263Censys host search filtered to this CVE id.
grep.app
CVE-2026-71263Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-71263GitHub code search for direct mentions.
Google dork
"CVE-2026-71263" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-71263 on GitHub.