Vulnerability-Lookup

WID-SEC-W-2026-2927

Vulnerability from csaf_certbund - Published: 2026-08-19 22:00 - Updated: 2026-09-06 22:00

Summary

Citrix Systems NetScaler (Gateway und ADC): Mehrere Schwachstellen

Severity

Kritisch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Citrix NetScaler ist eine integrierte Lösung für die Beschleunigung, das Traffic Management und die Sicherheit von Web-Applikationen. Citrix Access Gateway ist ein universell einsetzbares SSL-VPN. Advanced Access Control (AAC) ermöglichen es Administratoren, Zugriffsregeln für das Access Gateway festzulegen.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Citrix Systems NetScaler (Gateway und ADC) ausnutzen, um einen Denial of Service Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

Betroffene Betriebssysteme: - Sonstiges

CVE-2026-19489

Affected products

Known affected 4 products

Product	Identifier	Version	Remediation
Citrix Systems NetScaler Gateway <14.1-73.32 Citrix Systems / NetScaler		Gateway <14.1-73.32
Citrix Systems NetScaler Gateway <13.1-63.21 Citrix Systems / NetScaler		Gateway <13.1-63.21
Citrix Systems NetScaler ADC <14.1-73.32 Citrix Systems / NetScaler		ADC <14.1-73.32
Citrix Systems NetScaler ADC <13.1-63.21 Citrix Systems / NetScaler		ADC <13.1-63.21

CVE-2026-19490

Affected products

Known affected 4 products, the same list as for CVE-2026-19489

References

5 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://support.citrix.com/support-home/kbsearch/…	external
https://cert.europa.eu/publications/security-advi…	external
https://previdian.com/CVE-2026-19490	external

JSON

To clipboard

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CVE-2026-19489 (GCVE-0-2026-19489)

Vulnerability from cvelistv5 – Published: 2026-08-19 12:45 – Updated: 2026-08-20 13:36

Summary

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 13:36 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

NetScaler mitre root Scorecard

References

1 reference

URL	Tags
https://support.citrix.com/support-home/kbsearch/…

Impacted products

2 products

Vendor	Product	Version
NetScaler	ADC	Affected: 14.1 , ≤ 73.32 (patch) Affected: 13.1 , ≤ 63.21 (patch)
NetScaler	Gateway	Affected: 14.1 , ≤ 73.32 (patch) Affected: 13.1 , ≤ 63.21 (patch)

Show details on NVD website

JSON

To clipboard

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CVE-2026-19490 (GCVE-0-2026-19490)

Vulnerability from cvelistv5 – Published: 2026-08-19 12:54 – Updated: 2026-09-10 03:55

Title

NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490

Summary

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

Severity

9.3 (Critical)


                        
                          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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 00:00 UTC

CWE

CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Assigner

NetScaler mitre root Scorecard

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
NetScaler	ADC	Affected: 14.1 , ≤ 73.32 (patch) Affected: 13.1 , ≤ 63.21 (patch)
NetScaler	Gateway	Affected: 14.1 , ≤ 73.32 (patch) Affected: 13.1 , ≤ 63.21 (patch)

Show details on NVD website

JSON

To clipboard

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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.

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.

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.

Action not permitted

WID-SEC-W-2026-2927

CVE-2026-19489 (GCVE-0-2026-19489)

CVE-2026-19490 (GCVE-0-2026-19490)

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Related by attack behaviour