CVE
Citrix NetScaler ADC denial of service in Endpoint Analysis (EPA)
- Exploited
- No known exploitation
- Fix
- Fixed in NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39.
- Published
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 40/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
A memory overflow in the Endpoint Analysis (EPA/EPAS) component of Citrix NetScaler ADC and NetScaler Gateway can cause unpredictable or erroneous behavior or a denial of service. An attacker can reach it remotely over the network without logging in, and no user interaction is needed.
Written by anthropic/claude-sonnet-5.5 from the sources below. Verify against them.
Read the original description
Memory overflow in Endpoint Analysis (EPA/EPAS) can lead to unpredictable or erroneous behavior or a Denial of Service in Citrix NetScaler ADC and Citrix NetScaler Gateway.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed per the CVSS vector, reachable over the network without a login · Unknown: No advisory context yet
- Reach14/20Affects Citrix (an enterprise product or network appliance)
- Severity9.3/10CVSS 9.3
- No patch0/5No signal
What would change the score
- Would score about 85 if added to CISA KEV
- Would score about 80 if CISA's SSVC rates exploitation active
- Would score about 45 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-111334 (Memory overflow in Endpoint Analysis (EPA/EPAS) can lead to unpredictable or erroneous behavior or a Denial of Service in Citrix NetScaler…), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-111334 (entry last updated 2026-11-13):
Affected:
- Citrix NetScaler ADC: fixed in 14.1-73.57; fixed in 13.1-64.39; fixed in 14.1-73.58 FIPS
- Citrix NetScaler Gateway: fixed in 14.1-73.57; fixed in 13.1-64.39
Fixed versions: 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-111334 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-111334 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697305
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-111334
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-111334"}.Timeline
- cve.now early warning
Citrix patches critical NetScaler and Secure Access Client flaws, including authentication bypass
1 day - CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- Citrix NetScaler ADC
fixed in 14.1-73.57; fixed in 13.1-64.39; fixed in 14.1-73.58 FIPS
- Citrix NetScaler Gateway
fixed in 14.1-73.57; fixed in 13.1-64.39
Evidence 3
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-111334
Is CVE-2026-111334 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-111334?
NetScaler ADC: before 14.1-73.57; before 13.1-64.39; before 14.1-73.58 FIPS. NetScaler Gateway: before 14.1-73.57; before 13.1-64.39.Source: cve.now feed data
How do I fix CVE-2026-111334?
Upgrade to a fixed version: NetScaler ADC 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS · NetScaler Gateway 14.1-73.57, 13.1-64.39.Source: cve.now feed data