CVE-2026-3055
Citrix — Citrix NetScaler Out-of-Bounds Read Vulnerability
Citrix · CWE-125 — Out-of-bounds read · in CISA KEV since 2026-03-30
EVRS 75 of 100 Urgent
Patch This Cycle
Rank 1,143 of 2,960 tracked
Raised to the floor for a confirmed exploited vulnerability.
Why it scores 75
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and an EPSS probability of 0.040.
- CISA KEVApplied
- RansomwareDid not apply
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
- support.citrix.com/…/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368
- nvd.nist.gov/…/CVE-2026-3055
Fixed in
netscaler application delivery controller: update to 13.1-37.262 or later | netscaler application delivery controller: update to 13.1-62.23 or later | netscaler application delivery controller: update to 14.1-60.58 or later | netscaler gateway: update to 13.1-62.23 or later | netscaler gateway: update to 14.1-60.58 or later
Affected versions
- netscaler application delivery controller
>= 13.1 < 13.1-37.262>= 13.1 < 13.1-62.23>= 14.1 < 14.1-60.58 - netscaler gateway
>= 13.1 < 13.1-62.23>= 14.1 < 14.1-60.58
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 9.3 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.040 (90.6th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Unknown or none | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2026-04-02 · CISA federal deadline · Overdue by 7 months | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | Public module exists | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 9.3 (v4.0), assigned by NetScaler. | Listed | ENISA EUVD |
Description
NVDInsufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
What CISA says to do
- support.citrix.com/…/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368
- nvd.nist.gov/…/CVE-2026-3055
Public module
Metasploit lists a public normal-rank module for this CVE: Citrix ADC (NetScaler) CVE-2026-3055 Scanner (scanner/http/citrix_netscaler_cve_2026_3055). A module existing is not the same as active exploitation; see metasploit.com.