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CERTFR-2026-AVI-1235
Vulnerability from certfr_avis - Published: 2026-09-28 - Updated: 2026-09-28
De multiples vulnérabilités ont été découvertes dans Citrix NetScaler ADC et Gateway. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.
Citrix indique que les vulnérabilités CVE-2026-88771 et CVE-2026-88772 sont activement exploitées.
L'éditeur indique que si les correctifs n'ont pas été installés, tous les équipements sont vulnérables dans leur configuration par défaut.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Citrix | NetScaler ADC | Citrix NetScaler ADC versions 14.1-FIPS antérieures à 14.1-73.37 FIPS | ||
| Citrix | NetScaler ADC | Citrix NetScaler ADC versions 13.1-FIPS antérieures à 13.1-NDcPP 13.1.37.279 | ||
| Citrix | NetScaler Gateway | NetScaler Gateway versions 13.1.x antérieures à 13.1-64.23 | ||
| Citrix | NetScaler Gateway | NetScaler Gateway versions 14.1.x antérieures à 14.1-73.37 | ||
| Citrix | NetScaler ADC | Citrix NetScaler ADC versions 14.1.x antérieures à 14.1-73.37 | ||
| Citrix | NetScaler ADC | Citrix NetScaler ADC versions 13.1.x antérieures à 13.1-64.23 |
References
| Title | Publication Time | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Citrix NetScaler ADC versions 14.1-FIPS ant\u00e9rieures \u00e0 14.1-73.37 FIPS",
"product": {
"name": "NetScaler ADC",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix NetScaler ADC versions 13.1-FIPS ant\u00e9rieures \u00e0 13.1-NDcPP 13.1.37.279",
"product": {
"name": "NetScaler ADC",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "NetScaler Gateway versions 13.1.x ant\u00e9rieures \u00e0 13.1-64.23",
"product": {
"name": "NetScaler Gateway",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "NetScaler Gateway versions 14.1.x ant\u00e9rieures \u00e0 14.1-73.37",
"product": {
"name": "NetScaler Gateway",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix NetScaler ADC versions 14.1.x ant\u00e9rieures \u00e0 14.1-73.37",
"product": {
"name": "NetScaler ADC",
"vendor": {
"name": "Citrix",
"scada": false
}
}
},
{
"description": "Citrix NetScaler ADC versions 13.1.x ant\u00e9rieures \u00e0 13.1-64.23",
"product": {
"name": "NetScaler ADC",
"vendor": {
"name": "Citrix",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-88777",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88777"
},
{
"name": "CVE-2026-88776",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88776"
},
{
"name": "CVE-2026-88771",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88771"
},
{
"name": "CVE-2026-88772",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88772"
},
{
"name": "CVE-2026-88775",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88775"
},
{
"name": "CVE-2026-88774",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88774"
},
{
"name": "CVE-2026-88773",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88773"
},
{
"name": "CVE-2026-88778",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-88778"
}
],
"initial_release_date": "2026-09-28T00:00:00",
"last_revision_date": "2026-09-28T00:00:00",
"links": [
{
"title": "Billet de blogue Citrix du 27 septembre 2026",
"url": "https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778/#Indicators_of_Compromise__cabcb4"
}
],
"reference": "CERTFR-2026-AVI-1235",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-09-28T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Citrix NetScaler ADC et Gateway. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance, un d\u00e9ni de service \u00e0 distance et un contournement de la politique de s\u00e9curit\u00e9.\n\nCitrix indique que les vuln\u00e9rabilit\u00e9s CVE-2026-88771 et CVE-2026-88772 sont activement exploit\u00e9es.\n\nL\u0027\u00e9diteur indique que si les correctifs n\u0027ont pas \u00e9t\u00e9 install\u00e9s, tous les \u00e9quipements sont vuln\u00e9rables dans leur configuration par d\u00e9faut.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Citrix NetScaler ADC et Gateway",
"vendor_advisories": [
{
"published_at": "2026-09-27",
"title": "Bulletin de s\u00e9curit\u00e9 Citrix CTX697096",
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096\u0026articleURL=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778"
}
]
}
CVE-2026-88771 (GCVE-0-2026-88771)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:02 – Updated: 2026-09-29 03:55
VLAI
EPSS
VEX
Title
A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands
Summary
Improper input validation 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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-27 00:00 UTC
CWE
- CWE-20 - Improper input validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://support.citrix.com/support-home/kbsearch/… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
Date Public
2026-09-27 15:51
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CVE-2026-88772 (GCVE-0-2026-88772)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:09 – Updated: 2026-09-28 03:55
VLAI
EPSS
VEX
Title
Memory overflow vulnerability leading to Remote Code Execution or Denial of Service
Summary
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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to Remote Code Execution or Denial of Service
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-27 00:00 UTC
CWE
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://support.citrix.com/support-home/kbsearch/… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
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CVE-2026-88773 (GCVE-0-2026-88773)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:20 – Updated: 2026-09-29 15:21
VLAI
EPSS
VEX
Title
HTTP Request Smuggling
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:17 UTC
CWE
- CWE-444 - Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
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|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37 FIPS
(Patch)
Affected: 0 , < 13.1-64.23 (Patch) |
Date Public
2026-09-27 15:30
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CVE-2026-88774 (GCVE-0-2026-88774)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:14 – Updated: 2026-09-29 15:24
VLAI
EPSS
VEX
Title
Feature policy bypass due to improper HTTP URL based expression usage
Summary
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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to a feature policy bypass due to improper HTTP URL based expression usage.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:22 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
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CVE-2026-88775 (GCVE-0-2026-88775)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:21 – Updated: 2026-09-29 15:15
VLAI
EPSS
VEX
Title
Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
Summary
Memory overflow 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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:14 UTC
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
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CVE-2026-88776 (GCVE-0-2026-88776)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:36 – Updated: 2026-09-29 16:06
VLAI
EPSS
VEX
Title
Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
Summary
Memory overflow vulnerability 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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable or erroneous behavior or Denial of Service
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:11 UTC
CWE
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
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|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
Date Public
2026-09-27 15:30
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CVE-2026-88777 (GCVE-0-2026-88777)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:37 – Updated: 2026-09-29 21:01
VLAI
EPSS
VEX
Title
Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
Summary
Memory overflow vulnerability 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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable or erroneous behavior or Denial of Service
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 15:07 UTC
CWE
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) Affected: 0 , < 14.1-73.37 FIPS (patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(patch)
Affected: 0 , < 13.1-64.23 (patch) |
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CVE-2026-88778 (GCVE-0-2026-88778)
Vulnerability from cvelistv5 – Published: 2026-09-27 16:43 – Updated: 2026-09-29 16:35
VLAI
EPSS
VEX
Title
TCP Initial Sequence Number (ISN) prediction
Summary
Predictable exact value from previous values 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 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:34 UTC
CWE
- CWE-342 - Predictable exact value from previous values
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix NetScaler | ADC |
Affected:
0 , < 14.1-73.37
(Patch)
Affected: 0 , < 13.1-64.23 (Patch) Affected: 0 , < 14.1-73.37 FIPS (Patch) Affected: 0 , < 13.1.37.279 FIPS and NDcPP (Patch) |
|
| Citrix NetScaler | Gateway |
Affected:
0 , < 14.1-73.37
(Patch)
Affected: 0 , < 13.1-64.23 (Patch) |
Date Public
2026-09-27 15:30
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Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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