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The labeled-response module in UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" message tag when echoing it into replies, which allows any user on a network with two or more linked servers to inject server-to-server commands that are executed with server authority.
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Listed in CISA KEV · added 13 Nov 2026 · UnrealIRCd · UnrealIRCd
UnrealIRCd UnrealIRCd contains an improper neutralization of delimiters vulnerability that allows any user on a network with two or more linked servers to inject server-to-server commands that are executed with server authority.
CISA source · CISA-cited reference
No EPSS score is available here for this CVE.
Saved 13 Nov 2026 18:59:39 UTC · View this risk record (JSON)
The labeled-response module in UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" message tag when echoing it into replies, which allows any user on a network with two or more linked servers to inject server-to-server commands that are executed with server authority.
Original source record · Cite this exact observation · Complete original publisher JSON
Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N