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NVD / CVE Program· CNA NetScaler

CVE-2026-88779: Memory overflow vulnerability leading to Denial of Service

Noroxi assessment

Priority: This week (action score 67/100)

  • CISA has confirmed exploitation in the wild (Oct 4, 2026). Remediation deadline for US federal agencies: Oct 7, 2026.
  • Probability of exploitation in the next 30 days: 11.3% (FIRST EPSS); higher than 95.9% of all records.
  • 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 13.1-37.282, 13.1-64.28, 14.1-73.41; NetScaler Gateway 13.1-64.28, 14.1-73.41.

Don’t wait for the next maintenance window. Upgrade to NetScaler ADC 13.1-37.282, 13.1-64.28, 14.1-73.41; NetScaler Gateway 13.1-64.28, 14.1-73.41 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

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

HighCVSS 8.7 · v4.0KEVWeaponized Fix available
Published
Oct 4, 2026
Updated
Oct 5, 2026
EPSS
11.3% · 95th percentile

Report tools

JSON

Action score

67

This week

Don’t wait for the next maintenance window.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
30 / 30 · Listed
EPSS
3 / 30 · 11.3%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · NetScaler
8.7
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:N/VI:N/VA:H/SC:N/SI:N/SA:N

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 Oct 4, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Oct 7, 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-2026-88779

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

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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 application delivery controller13.1 and later · before 13.1-37.282
  • citrix netscaler application delivery controller13.1 and later · before 13.1-64.28
  • citrix netscaler application delivery controller14.1 and later · before 14.1-73.41
  • citrix netscaler application delivery controller14.1-66.68 and later · up to 14.1-73.41 inclusive
  • citrix netscaler gateway13.1 and later · before 13.1-64.28
  • citrix netscaler gateway14.1 and later · before 14.1-73.41

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

    • before 14.1-73.41affected · Patch
    • before 13.1-64.28affected · Patch
    • before 14.1-73.41 FIPSaffected · Patch
    • before 13.1-37.282affected · Patch

  • NetScaler Gateway

    • before 14.1-73.41affected · Patch
    • before 13.1-64.28affected · 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-2026-3055Insufficient input validation leading to memory overreadKEV
    94Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-88776Sep 27, 2026 · Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
    35Monitor
  • ← EarlierCVE-2026-88777Sep 27, 2026 · Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
    35Monitor
  • ← EarlierCVE-2026-88778Sep 27, 2026 · TCP Initial Sequence Number (ISN) prediction
    35Monitor

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 ADC13.1-37.282Vendor (CNA)
NetScaler ADC13.1-64.28Vendor (CNA)
NetScaler ADC14.1-73.41Vendor (CNA)
NetScaler ADC14.1-73.41 FIPSVendor (CNA)
NetScaler Gateway13.1-64.28Vendor (CNA)
NetScaler Gateway14.1-73.41Vendor (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.

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. CISA KEVsame day
  2. Published
  3. Fix recordedsame day
  4. TodayNov 3, 2026+30 d
EPSS, last 120 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-2026-887727 days apartMemory overflow vulnerability leading to Remote Code Execution or Denial of ServiceKEV
    91Now
  • CVE-2025-7775404 days apartMemory overflow vulnerability leading to Remote Code Execution and/or Denial of ServiceKEV
    72This week
  • CVE-2025-6543466 days apartMemory overflow vulnerability leading to unintended control flow and Denial of ServiceKEV
    69This week
  • CVE-2026-845296 days apartMemory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of ServiceKEV
    65This week
  • CVE-2025-7776404 days apartMemory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
    38Monitor
  • CVE-2026-887777 days apartMemory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
    35Monitor

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-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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. SSVC exploitationnone → active
  2. Exploit maturitynone → weaponized
  3. KEV✗ → ✓
  4. SSVC exploitation— → none
  5. Fix✗ → ✓
  6. Exploit maturity— → none

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

References

Show all references (2 more)

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

All records