# CVE-2025-6543

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

- Page: https://www.vulneraibility.com/cve/CVE-2025-6543
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2025-06-30; CISA due date 2025-07-21
- EPSS: 10.43%
- Unvetted proof-of-concept code on GitHub: 3 GitHub proofs of concept (first 2025-06-26)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-07-17)
- Weakness: CWE-119
- Published: 2025-06-25

## Affected versions

- NetScaler ADC: affected >= 14.1 and < 47.46; >= 13.1 and < 59.19; >= 13.1 FIPS and NDcPP and < 37.236
- NetScaler Gateway: affected >= 14.1 and < 47.46; >= 13.1 and < 59.19; >= 13.1 FIPS and NDcPP and < 37.236

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.