There are 2 definitions of vuln in English:

vuln1

Line breaks: vuln
Pronunciation: /vʌln
 
/

verb

[with object] Heraldry
Wound: the crest depicts a pelican vulning itself
More example sentences
  • A dragon and on its back a pelican vulning herself all Proper.
  • A stag standing vulned in the back with an arrow proper.

Origin

late 16th century: formed irregularly from Latin vulnerare 'to wound'.

Definition of vuln in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of vuln in English:

vuln2

Syllabification: vuln

Entry from US English dictionary

noun

A vulnerability, especially one associated with computer security: the total of 10 vulns discovered are described as highly critical

Definition of vuln in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…