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NVD / CVE Program· CNA NetScaler

CVE-2026-3055: Insufficient input validation leading to memory overread

Noroxi assessment

Priority: Now (action score 94/100)

  • CISA has confirmed exploitation in the wild (Mar 30, 2026). Remediation deadline for US federal agencies: Apr 2, 2026.
  • A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 91.4% (FIRST EPSS); higher than 99.8% of all records.
  • This probability rose by 87 points in the last 7 days.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: NetScaler ADC 37.262, 62.23, 66.59; NetScaler Gateway 62.23, 66.59.

Patch today or shut off access. Upgrade to NetScaler ADC 37.262, 62.23, 66.59; NetScaler Gateway 62.23, 66.59 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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

CriticalCVSS 9.3 · v4.0KEVWeaponized Fix available
Published
Mar 23, 2026
Updated
Jun 17, 2026
EPSS
91.4% · 99th percentile▲ 87

Report tools

JSON

Action score

94

Now

Patch today or shut off access.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
30 / 30 · Listed
EPSS
27 / 30 · 91.4%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · NetScaler
9.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 30, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Apr 2, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-3055

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
citrixnetscaler application delivery controller
citrixnetscaler gateway

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • citrix netscaler gateway13.1 and later · before 13.1-62.23
  • citrix netscaler gateway14.1 and later · before 14.1-60.58

Versions reported by the vendor

Affected version ranges reported by the assigning authority (NetScaler). Independent of NVD's CPE analysis and usually ahead of it.

  • NetScaler ADC

    • 14.1 and later · before 66.59affected · patch
    • 13.1 and later · before 62.23affected · patch
    • 13.1 FIPS and NDcPP and later · before 37.262affected · patch

  • NetScaler Gateway

    • 14.1 and later · before 66.59affected · patch
    • 13.1 and later · before 62.23affected · patch

Same product

citrix: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-3519Unauthenticated remote code executionKEV
    99Now
  • CVE-2025-5777NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overreadKEV
    97Now
  • CVE-2026-88771A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commandsKEV
    93Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-7775Aug 26, 2025 · Memory overflow vulnerability leading to Remote Code Execution and/or Denial of ServiceKEV
    72This week
  • ← EarlierCVE-2025-7776Aug 26, 2025 · Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
    38Monitor
  • Later →CVE-2026-10816Jun 30, 2026 · Arbitrary File Read (Unauthenticated)
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
NetScaler ADC37.262Vendor (CNA)
NetScaler ADC62.23Vendor (CNA)
NetScaler ADC66.59Vendor (CNA)
NetScaler Gateway62.23Vendor (CNA)
NetScaler Gateway66.59Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleauxiliary/scanner/http/citrix_netscaler_cve_2026_3055Citrix ADC (NetScaler) CVE-2026-3055 Scannerauxiliary2026-03-23
Nuclei detection templateNuclei template CVE-2026-3055 —
Proof-of-concept repository on GitHubstars:02026-03-29
Proof-of-concept repository on GitHubstars:12026-03-31
Proof-of-concept repository on GitHubstars:12026-03-31
Proof-of-concept repository on GitHubstars:12026-04-01
Proof-of-concept repository on GitHubstars:02026-04-19

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-1 d
  2. Published
  3. First PoC+5 d
  4. CISA KEV+6 d
  5. TodayOct 29, 2026+220 d
EPSS, last 120 days+87% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-5777279 days apartNetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overreadKEV
    97Now
  • CVE-2026-845199 days apartInsufficient input validation leading to memory overread
    35Monitor
  • CVE-2026-1081799 days apartInsufficient input validation leading to memory overread
    27Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS 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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records