Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    Glossary
A  |  B  |  C  |  D  |  E  |  F  |  G  |  H  |  I  |  J  |  K  |  L  |  M  |  N  |  O  |  P  |  Q  |  R  |  S  |  T  |  U  |  V  |  W  |  X  |  Y  |  Z

availability

Definitions:

  Ensuring timely and reliable access to and use of information.
Sources:
FIPS 200 under AVAILABILITY from 44 U.S.C., Sec. 3542
NIST SP 800-137 under Availability from 44 U.S.C., Sec. 3542
NIST SP 800-171r3 from 44 U.S.C., Sec. 3552
NIST SP 800-172 from 44 U.S.C., Sec. 3552
NIST SP 800-172A from 44 U.S.C., Sec. 3552
NIST SP 800-18 Rev. 1 under Availability from 44 U.S.C., Sec. 3542
NIST SP 800-30 Rev. 1 under Availability from 44 U.S.C., Sec. 3542
NIST SP 800-37 Rev. 2 from 44 U.S.C., Sec. 3552
NIST SP 800-39 under Availability from 44 U.S.C., Sec. 3542
NIST SP 800-53 Rev. 5 from PL 113-283 (FISMA)
NIST SP 800-53A Rev. 5 under Availability from PL 113-283 (FISMA)
NIST SP 800-53B from PL 113-283 (FISMA)
NIST SP 800-60 Vol. 1 Rev. 1 under Availability from 44 U.S.C., Sec. 3542
NIST SP 800-60 Vol. 2 Rev. 1 under Availability from 44 U.S.C., Sec. 3542
NIST Privacy Framework Version 1.0 under Availability from 44 U.S.C., Sec. 3542
NISTIR 7497 under Availability from 44 U.S.C., Sec. 3542
NISTIR 7621 Rev. 1 under Availability from 44 U.S.C., Sec. 3542

  1. Ensuring timely and reliable access to and use of information.
Sources:
CNSSI 4009-2015 from 44 U.S.C., Sec. 3542

  As defined in FISMA, the term 'availability' means ensuring timely and reliable access to and use of information.
Sources:
NIST SP 800-59 under Availability from 44 U.S.C., Sec. 3542 (b)(1)(C)

  2. Timely, reliable access to data and information services for authorized users.
Sources:
CNSSI 4009-2015 from NSA/CSS Manual Number 3-16 (COMSEC)

  The ability for authorized users to access systems as needed.
Sources:
NIST SP 800-113 under Availability

  Timely, reliable access to information or a service.
Sources:
NIST SP 800-152 under Availability

  the timely, reliable access to data and information services for authorized users.
Sources:
NIST SP 800-16 under Availability

  Timely, reliable access to information by authorized entities.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Availability
NIST SP 800-57 Part 2 Rev.1 under Availability

  Property of being accessible and usable on demand by an authorized entity.
Sources:
NIST SP 800-160v1r1 from ISO/IEC 7498-2:1989

  The property that data or information is accessible and usable upon demand by an authorized person.
Sources:
NIST SP 800-66r2 from HIPAA Security Rule - §164.304

  The state that exists when data can be accessed or a requested service provided within an acceptable period of time.
Sources:
NISTIR 4734 under Availability

  measures an attacker’s ability to disrupt or prevent access to services or data. Vulnerabilities that impact availability can affect hardware, software, and network resources, such as flooding network bandwidth, consuming large amounts of memory, CPU cycles, or unnecessary power consumption.
Sources:
NISTIR 7946 under Availability