CVE•Published 2026-06-25•Modified 2026-06-25•0 articles on news•5 live references•NVD data
CVE-2026-40209
Vulnerability data via NVD (ingested)
CVSS v3.1
5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS percentile
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Weaknesses (CWE)
Description
An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.
Timeline
Published 2026-06-25
Modified 2026-06-25
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-2026-40209Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-40209Censys host search filtered to this CVE id.
grep.app
CVE-2026-40209Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-40209GitHub code search for direct mentions.
Google dork
"CVE-2026-40209" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-40209 on GitHub.
We haven't classified any articles referencing CVE-2026-40209 yet. The external references above still apply.