Networks

CVE-2026-120868

Remote memory overflow in Citrix NetScaler packet processing causing service outage

Major vulnerability. High-severity remote DoS (CVSS 9.3) in Citrix NetScaler/ADC/Gateway — widely deployed enterprise network infrastructure; outage risk across organizations.

CVSS: 9.3Criticalscored by the publisher (CNA)
Exploited in the wild: Not knownnot in CISA KEV as of our last sync
EPSS: No score yet
Fix: Not stated by the vendorno fixed release in the CVE record
Published: 12 Nov 2026analysed here 13 Nov 2026

Summary

Impact

Remote Denial of Service: crafted packets trigger memory overflow causing ADC/Gateway process crash and service outage.

Triage

Exploitable: At runtime
Attack vector: network
Can a WAF block it?: No. See why

The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.

Affected products

Product	Affected versions	Vendor says fixed in
Citrix NetScaler ADC	< 14.1-73.57< 13.1-64.39< 14.1-73.58 FIPS< 13.1-37.293 FIPs and NDcPPVendor says fixed in: not stated	Not stated by the vendor
Citrix NetScaler Gateway	< 14.1-73.57< 13.1-64.39Vendor says fixed in: not stated	Not stated by the vendor

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

Products named in our analysis

Citrix NetScaler ADC
Citrix NetScaler Gateway

Fix and mitigation

Action required

Immediate action required

WAF and other mitigations

Can a WAF block it? No. The vulnerability is triggered by packet processing in Citrix NetScaler, which involves non-HTTP network traffic. Since the attack uses a non-HTTP protocol, a web application firewall cannot filter or block the malicious packets.

Also consider: patch

Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

Remediation steps (AI-written)

Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.

Exploitation evidence

CISA KEV catalog: Not listed as of our last sync.
Public exploit code: None on record in Exploit-DB, Metasploit, Nuclei templates or PoC-in-GitHub.

Timeline

12 Nov 2026Published
12 Nov 2026CVE record last updatedsame day later
13 Nov 2026Analysed by vulneraibility.comsame day later

Common questions

Is CVE-2026-120868 being exploited?

Not confirmed. CVE-2026-120868 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.

How severe is CVE-2026-120868?

CVE-2026-120868 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-120868?

Not known from our data. No patch reference has been recorded for CVE-2026-120868, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.

What does CVE-2026-120868 affect?

CVE-2026-120868 affects Citrix NetScaler ADC, Citrix NetScaler Gateway. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-120868?

Apply Citrix patches/workarounds ASAP; block/inspect traffic to ADC/Gateway and monitor logs

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

References

NVD CVE.org CVE Details Source

1 reference in the CVE record, grouped by the tags the record gives them.

Where the data on this page comes from

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
FIRST EPSS: exploit probability and percentile

Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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