9.8

CVE-2026-3055: Citrix NetScaler Out-of-Bounds Read Vulnerability

CVSS: 9.8v3.1CriticalKEVAnalyzed
Published 23-03-2026Last modified 31-03-2026
Open JSON

Vulnerability summary

CVE-2026-3055 is a critical (CVSS 9.8) Out-of-bounds Read vulnerability in Citrix NetScaler. It is known to be exploited: CISA lists it, first on 30-03-2026. EPSS estimates a 4.04% chance of exploitation in the next 30 days, higher than 90.5% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
4.04%
0%100%
Low · -83.12 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits2reference, metasploit

Timeline

  1. 23-03-2026
    PublishedVulnerability first disclosed.
  2. 30-03-2026
    Added to CISA KEVCitrix NetScaler Out-of-Bounds Read Vulnerability
  3. 31-03-2026
    Last modifiedVulnerability information updated.
  4. 02-04-2026
    CISA remediation dueApply mitigations per vendor instructions.

Description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

4.04%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

-83.12 pp

From 87.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
4.04%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
30-03-2026
Federal due date
02-04-2026

CISA 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. support.citrix.com/support-home/… nvd.nist.gov/vuln/detail/CVE-2026-3055

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (labs.watchtowr.com)

    Maturity: unknown

  • MetasploitMetasploitremoteUnverified

    Citrix ADC (NetScaler) CVE-2026-3055 Scanner

    auxiliary/scanner/http/citrix_netscaler_cve_2026_3055

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Citrix2 products
Netscaler2 products
  • adc≥ 14.1, < 66.59 | ≥ 13.1, < 62.23 | ≥ 13.1 FIPS and NDcPP, < 37.262
  • gateway≥ 14.1, < 66.59 | ≥ 13.1, < 62.23

2 vendors · 4 products

References

3 links