CVE-2025-7775
Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Description
Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX
Official description from the CVE record, published by Citrix. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
CVSS 4.0 Critical 9.2
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attacker has to evade or get around security controls that are in place, which takes target-specific work.
Attack requirements: Present
The attack depends on certain deployment or execution conditions being present.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Vulnerable system: confidentiality: High
Serious or total effect on the secrecy of data.
Vulnerable system: integrity: High
Serious or total effect on the trustworthiness of data.
Vulnerable system: availability: High
Serious or total effect on availability.
Subsequent systems: confidentiality: Low
Limited effect on other systems' data secrecy.
Subsequent systems: integrity: Low
Limited effect on other systems' data trustworthiness.
Subsequent systems: availability: Low
Limited effect on other systems' availability.
| Metric | Value | What it means |
|---|---|---|
| Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity | High | The attacker has to evade or get around security controls that are in place, which takes target-specific work. |
| Attack requirements | Present | The attack depends on certain deployment or execution conditions being present. |
| Privileges required | None | No account or privileges are needed. |
| User interaction | None | No action from any user is needed. |
| Vulnerable system: confidentiality | High | Serious or total effect on the secrecy of data. |
| Vulnerable system: integrity | High | Serious or total effect on the trustworthiness of data. |
| Vulnerable system: availability | High | Serious or total effect on availability. |
| Subsequent systems: confidentiality | Low | Limited effect on other systems' data secrecy. |
| Subsequent systems: integrity | Low | Limited effect on other systems' data trustworthiness. |
| Subsequent systems: availability | Low | Limited effect on other systems' availability. |
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EPSS
- Score
- 0.20670 (20.7% probability)
- Percentile
- 97.5%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA Known Exploited Vulnerabilities
- Name in the catalog
- Citrix NetScaler Memory Overflow Vulnerability
- Added to the catalog
- Aug 26, 2025
- Federal due date
- Aug 28, 2025
CISA assessment as of Aug 27, 2025
- Exploitation
- Recorded by CISA as active
- Automatable
- no
- Technical impact
- total
Weakness (CWE)
- CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
NetScaler ADC
- affected: 14.1 up to before 47.48
- affected: 13.1 up to before 59.22
- affected: 13.1 FIPS and NDcPP up to before 37.241
- affected: 12.1 FIPS and NDcPP up to before 55.330
NetScaler Gateway
- affected: 14.1 up to before 47.48
- affected: 13.1 up to before 59.22
- affected: 13.1 FIPS and NDcPP up to before 37.241
- affected: 12.1 FIPS and NDcPP up to before 55.330
References
Timeline
- ID reserved
- Added to CISA KEV
- Record published
- Record last updated
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:15 UTC. Sources and licenses