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Public proof of conceptFix available

CVE-2026-88773

A public proof of concept exists; no exploitation attested.

  • Published2026-09-27
  • Fixed in14.1-73.37 · 13.1.37.279 · 13.1-64.23
  • WeaknessCWE-444

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

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1-37.279 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.

Timeline

dates in UTC
  1. 2026-09-2717:16CVE publishedNVD

Versions per branch

NVD
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-73.3714.1-73.37
13.1≥ 13.1, < 13.1.37.27913.1.37.279
13.1≥ 13.1, < 13.1-64.2313.1-64.23
14.1≥ 14.1-66.68, ≤ 14.1-73.37no fix published
Citrix NetScaler ADC
BranchAffectedFixed in
14.1≥ 14.1, < 14.1-73.3714.1-73.37
13.1≥ 13.1, < 13.1-64.2313.1-64.23

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

  • Citrix NetScaler ADCother versions: not affected
    Affected
    • < 14.1-73.37fixed in 14.1-73.37Patch
    • < 13.1-64.23fixed in 13.1-64.23Patch
    • < 14.1-73.37 FIPSfixed in 14.1-73.37 FIPSPatch
    • < 13.1-37.279 and NDcPPfixed in 13.1-37.279 and NDcPPPatch
  • Citrix NetScaler Gatewayother versions: not affected
    Affected
    • < 14.1-73.37 FIPSfixed in 14.1-73.37 FIPSPatch
    • < 13.1-64.23fixed in 13.1-64.23Patch

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-27

Fix

  1. Update Citrix NetScaler ADC to 14.1-73.37 · 13.1.37.279 · 13.1-64.23

Advisories and patches

Detection

read 2026-11-01 22:43 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/freebsd/http/citrix_netscaler_cve_2026_88771rank: normalModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/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
Published
2026-09-27
Last Modified
2026-09-29
NVD status
Analyzed
GitHub Advisory
GHSA-9x87-2c36-ffjf

Frequently asked questions

What is CVE-2026-88773?

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1-37.279 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.

Is CVE-2026-88773 actively exploited?

Active exploitation of CVE-2026-88773 has not been confirmed. Its EPSS score was 3.1% on 2026-11-12, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-88773?

CVE-2026-88773 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.

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