9.8

CVE-2026-8452: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

CVSS: 9.8v3.1CriticalKEVAnalyzed
Published 30-06-2026Last modified 27-08-2026
Open JSON

Vulnerability summary

CVE-2026-8452 is a critical (CVSS 9.8) vulnerability in Citrix NetScaler ADC and NetScaler Gateway. It is known to be exploited: CISA lists it, first on 26-08-2026. EPSS estimates a 1.01% chance of exploitation in the next 30 days, higher than 62.5% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.01%
0%100%
Low · -0.60 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-06-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Added to CISA KEVCitrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
  3. 27-08-2026
    Last modifiedVulnerability information updated.
  4. 29-08-2026
    CISA remediation dueApply mitigations per vendor instructions.

Description

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.01%

Chance of exploitation in the next 30 days

Percentile

63%

Versus all other CVEs

30-day change

-0.60 pp

From 1.61% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.01%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
26-08-2026
Federal due date
29-08-2026

CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604 nvd.nist.gov/vuln/detail/CVE-2026-8452

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Citrix2 products
Netscaler2 products
  • adc≥ 14.1, < 72.61 | ≥ 13.1, < 63.18 | ≥ 14.1 FIPS, < 72.61 | ≥ 13.1 FIPS and NDcPP, < 37.272
  • gateway≥ 14.1, < 72.61 | ≥ 13.1, < 63.18

2 vendors · 4 products

References

2 links