CVE-2025-5777

Q: How do I fix CVE-2025-5777?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2025-5777 being actively exploited?

Yes. CVE-2025-5777 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2025-07-11. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2025-5777?

CVE-2025-5777 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-5777 affect?

Published advisories record a fix for netscaler application delivery controller (NVD), netscaler gateway (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

NVD

Description

Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

CWE-125Out-of-bounds Read CWE-908 CWE-457

How to fix

Remediation Available

netscaler application delivery controllerNVD

Affected:>= 12.1, < 12.1-55.328Fixed in:12.1-55.328CVE-2025-5777derived from NVD

Affected:>= 13.1, < 13.1-58.32Fixed in:13.1-58.32CVE-2025-5777derived from NVD

Affected:>= 13.1, < 13.1-37.235Fixed in:13.1-37.235CVE-2025-5777derived from NVD

Affected:>= 14.1, < 14.1-43.56Fixed in:14.1-43.56CVE-2025-5777derived from NVD

netscaler gatewayNVD

Affected:>= 13.1, < 13.1-58.32Fixed in:13.1-58.32CVE-2025-5777derived from NVD

Affected:>= 14.1, < 14.1-43.56Fixed in:14.1-43.56CVE-2025-5777derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

99.96%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability

Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-07-11

Associated with ransomware campaigns

References

Vendor Advisory1

support.citrix.com

Third-Party Advisory7

Government Resource1

cisa.gov

Press / Media1

theregister.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2023-21769	High	7.5	89%	-	Fix
CVE-2026-3055	Critical	9.8	84%	KEV	Fix

Common questions

How do I fix CVE-2025-5777?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2025-5777 being actively exploited?

Yes. CVE-2025-5777 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2025-07-11. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2025-5777?

CVE-2025-5777 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-5777 affect?

Published advisories record a fix for netscaler application delivery controller (NVD), netscaler gateway (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-04.