Skip to main content
ExploitedIn CISA KEVFix available

CVE-2025-5777

CitrixBleed 2: NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread

Exploitation confirmed. First attested on 2025-07-02 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2025-06-17
  • Fixed in14.1-43.56 · 13.1-37.235 · 13.1-58.32 · 12.1-55.328
  • WeaknessCWE-125 · CWE-908

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2025-06-1713:15CVE publishedNVD
  2. 2025-07-0210:06Listed as exploited by GCVEGCVE
  3. 2025-07-0210:06Exploitation first reportedGCVE
  4. 2025-07-10Added to the CISA KEV catalogCISA KEV
  5. 2025-08-11Exploit-DB entryExploit-DB
  6. 2026-08-0403:55SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-43.5614.1-43.56
13.1≥ 13.1, < 13.1-37.23513.1-37.235
13.1≥ 13.1, < 13.1-58.3213.1-58.32
12.1≥ 12.1, < 12.1-55.32812.1-55.328
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-43.5614.1-43.56
13.1≥ 13.1, < 13.1-58.3213.1-58.32

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As Citrix, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • NetScaler ADCother versions: not affected
    Affected
    • ≥ 14.1, < 43.56fixed in 43.56patch
    • ≥ 13.1, < 58.32fixed in 58.32patch
  • NetScaler Gatewayother versions: not affected
    Affected
    • ≥ 14.1, < 43.56fixed in 43.56patch
    • ≥ 13.1, < 58.32fixed in 58.32patch

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-06-24

Fix

  1. Update Citrix NetScaler ADC to 14.1-43.56 · 13.1-37.235 · 13.1-58.32 · 12.1-55.328
  2. CISA’s required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.due 2025-07-11

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-52401
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2025-07-10
Patch Due Date
2025-07-11
Ransomware Use
Known
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2025-06-17
Last Modified
2026-10-07
NVD status
Analyzed
GitHub Advisory
GHSA-29vj-j5w5-pcph

Frequently asked questions

What is CVE-2025-5777?

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

Is CVE-2025-5777 actively exploited?

Yes. CVE-2025-5777 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-07-11.

What is the CVSS score for CVE-2025-5777?

CVE-2025-5777 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, July 2025Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record